Annals of Warsaw University of Life Sciences
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Annals of Warsaw University of Life Sciences
ISSN 1898-8830 Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1) 2015 ISSN 1898-8830 1898 8830 Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1) 2015 Agriculture (Agricultural and Forest Engineering) Animal Science Forestry and Wood Technology Horticulture and Landscape Architecture Land Reclamation Editorial Board Bogdan Brzeziecki Ewa Dobrowolska Włodzimierz Kluciński Anna Kołłajtis-Dołowy Andrzej Lenart Małgorzata Łobocka Józef Mosiej Jan Niemiec Arkadiusz Orłowski Maria Parlińska Aurelia Radzik-Rant Stanisław Stępka Marek Szyndel Czesław Waszkiewicz Distribution Annals are distributed by the Bookshop of Warsaw University of Life Sciences Press, 166 Nowoursynowska St., Warsaw, Poland. WARSAW UNIVERSITY OF LIFE SCIENCES PRESS 166 Nowoursynowska St., 02-787 Warsaw Poland, tel. (48 22) 593 55 20 e-mail: [email protected] www.wydawnictwosggw.pl Agriculture (Agricultural and Forest Engineering) Animal Science Forestry and Wood Technology Horticulture and Landscape Architecture Land Reclamation Annals of Warsaw University of Life Sciences were originally published in 1957 as Zeszyty Naukowe SGGW (Scientific Fascicles of SGGW). In 1980 the name was changed to Annals of Warsaw University of Life Sciences. The Annals (5 subject series) are published once or twice a year and will carry previously unpublished papers that are mainly in English, but also in French, German or Russian, followed by a short summary in Polish. Manuscripts for publication should be typewritten and submitted to the Warsaw University of Life Sciences Press in two copies. Papers submitted for consideration by the Editorial board should not exceed 0.5 of a printed sheet (about 11 pages including illustrations, and should consist of the following elements: 1) name and surname of the author, 2) title of the paper, 3) abstract (about 20 lines), 4) text of the paper, 5) date when the paper was sent to the Warsaw University of Life Sciences Press and mailing address of the author, 6) summary (one page), 7) tables and figures with captions. Authors receive twenty five offprints free of change. Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1) Warsaw 2015 Contents BALCERAK M., KUNOWSKA-SLÓSARZ M., SLÓSARZ J., GOŁĘBIEWSKI M., BENET M., KUCZYŃSKA B., PRZYSUCHA T., NAŁĘCZ-TARWACKA T. Influence of the breed and country of origin on milk performance of primiparous cows 5 DYMNICKI E., GOŁĘBIEWSKI M., WÓJCIK A., PUPPEL K., KUCZYŃSKA B., SOSIN-BZDUCHA E., SZULC T. Changes in cow’s milk composition and physical properties during the uninterrupted milking process 15 GOŁĘBIEWSKI M., PIOTROWSKI T., BRZOZOWSKI P., GRODZKI H., PRZYSUCHA T., SLÓSARZ J., KUNOWSKA-SLÓSARZ M., NAŁĘCZ-TARWACKA T., WÓJCIK A. Relation between the shape and course of lactation curve and production traits of Polish Holstein-Friesian and Montbeliarde cows 27 KUCZYŃSKA B., PUPPEL K., NAŁĘCZ-TARWACKA T., CZUB M. Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow’s milk during grazing season 37 KUCZYŃSKA B., KAPUSTA A., PUPPEL K., NAŁĘCZ-TARWACKA T., BUDZIŃSKI A., GOŁĘBIEWSKI M., CZUB M., GRODZKI H. Relationships between milk β-carotene concentrations and the cytological quality of cow’s milk 45 KUCZYŃSKA B., BUDZIŃSKI A., KAPUSTA A., PUPPEL K., NAŁĘCZ-TARWACKA T., GOŁĘBIEWSKI M., WÓJCIK A., GRODZKI H. Relationships between production traits and the parity of Polish Holstein-Friesian cows 51 NAŁĘCZ-TARWACKA T., GOŁĘBIEWSKI M., KUCZYŃSKA B., PUPPEL K., WÓJCIK A., BRZEZIŃSKA M., CZUB M., BENET M. Changes in the concentration of selected minerals in milk and blood of high-milking cows during lactation 59 PRZYSUCHA T., GOŁĘBIEWSKI M., GRODZKI H., WNĘK K., SLÓSARZ J., KUNOWSKA-SLÓSARZ M., TOKARSKI P. Analysis of results assessment of growth of Charolais beef cattle in Poland 71 PRZYSUCHA T., GOŁĘBIEWSKI M., GRODZKI H., WNĘK K., SLÓSARZ J., KUNOWSKA-SLÓSARZ M., TOKARSKI P. Analysis of Limousine beef cattle recording results in Poland 83 SAKOWSKI T., PUPPEL K., GOŁĘBIEWSKI M., KUCZYŃSKA B., METERA E., GRODKOWSKI G. Influence of lactation stage on selected blood parameters and biological value of cow milk during pasture season in organic system of production 95 WNĘK K., GOŁĘBIEWSKI M., PRZYSUCHA T., WOŹNIAK A., WIERZBICKI J. Differences in the assessment of beef carcasses in EUROP system 105 SERIES EDITORIAL BOARD Editor-in-Chief prof. dr hab. Anna Rekiel Animal Science series Secretary dr Katarzyna Góral-Radziszewska Address of Editorial Office Wydział Nauk o Zwierzętach SGGW, ul. Ciszewskiego 8, 02-786 Warszawa, Poland EDITORS dr Wojciech Hyb – statistics editor Natalia Filipczak – English language consultant Agata Kropiwiec – Polish language consultant THEME EDITOR dr hab. Elżbieta Michalska – Genetics and animal breeding dr hab. Elżbieta Pezowicz – Biology and ecology dr hab. Iwona Kosieradzka – Animal nutrition and feedstuffs dr hab. Tadeusz Kaleta – Behaviour and welfare of animal dr hab. Justyna Więcek – Animal husbandry and production technology SERIES EDITOR Anna Rekiel SERIES EDITORIAL ADVISORY COUNCIL Prof. DSc. Andrzej Chwalibóg (Denmark) Prof. DSc. Konrad Dąbrowski (USA) Prof. DSc. Ondrey Debréceni (Slovakia) Prof. Ewgienij Dobruk (Belarus) Prof. dr hab. Robert J. Eckert (Poland) Prof. Dr Sophie Ermidou-Pollet (Greece) Prof. dr hab. Grażyna Garbaczewska (Poland) Prof. DSc. Luis L. Gosálvez (Spain) Prof. DSc. Adrian Harrison (Denmark) Prof. dr hab. Jarosław O. Horbańczuk (Poland) Prof. dr hab. Marta Kamionek (Poland) Prof. Dr Drago Kompan (Slovenia) Prof. Dr Sándor Kukovics (Hungary) Prof. Dr Stoycho Metodiev (Bulgarian) Prof. DSc Francois K. Siebrits (RSA) Prof. dr hab. Jacek Skomiał (Poland) Prof. dr hab. Romuald Zabielski (Poland) The Editorial Board (Office) of “Annals of Warsaw University of Life Sciences – SGGW. Animal Science” informs that the printed version of the journal is the original version. Redakcja „Annals of Warsaw University of Life Sciences – SGGW. Animal Science” informuje, że wersja drukowana czasopisma jest wersją pierwotną (referencyjną). Covered in: AGRO, Index Copernicus (5.85), CAB Direct, CEON, ARIANTA, ePNP. Bazy: AGRO, Index Copernicus (5.85), CAB Direct, CEON – Biblioteka Nauki, ARIANTA, e-Publikacje Nauki Polskiej. WARSAW UNIVERSITY OF LIFE SCIENCES PRESS ISSN 1898-8830 EDITORIAL STAFF Anna Dołomisiewicz Elżbieta Wojnarowska Edition: 150 prints PRINT: POLIMAX s.c., 161 L Nowoursynowska St., 02-787 Warsaw Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 5–14 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Influence of the breed and country of origin on milk performance of primiparous cows MAREK BALCERAK1, MAŁGORZATA KUNOWSKA-SLÓSARZ1, JAN SLÓSARZ1, MARCIN GOŁĘBIEWSKI1, MICHAŁ BENET2, BEATA KUCZYŃSKA1, TOMASZ PRZYSUCHA1, TERESA NAŁĘCZ-TARWACKA1 1 2 Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Dairy Cooperative “Spomlek” Abstract: Influence of the breed and country of origin on milk performance of primiparous cows. The aim of the study was comparison of the milk performance of primiparous cows from six European countries with Polish Holstein-Friesians, as well as to demonstrate the differences within the different genetic groups. Material consisted of data contained in the dairy reports gathered from 26 farm “Healthy Cow” project. The analysis involved data including milk yield and its chemical composition, i.e.: fat, protein, lactose, solids, and urea somatic cells count in milk. On the basis of these results, it was found that the country of origin had significant impact on daily milk yield, percentage of fat, percentage of protein, percentage of lactose and also affected dry matter content, urea and somatic cells in the milk of lactating cows. Research reviled that there were not differences in milk performance between imported and native cows. However, the breed of cows had an strong impact on daily milk production, percentage of protein, percentage of lactose, percentage of dry weight, as well as urea content and somatic cells count. Key words: primiparous cow, breed, milk components, country of origin INTRODUCTION Import of breeding material from western countries had a significant impact on the genetic improvement on population of Polish Holstein-Friesian cows (Barański et al. 2008, Czubska et al. 2009). The main advantages of the import of breeding material to Poland were improvement of the milk production and chemical composition as well as correction of cow body conformation (e.g. udder and feet). However, analysis conducted by other authors haven’t clearly confirmed if imported animals characterized by better milk performance than native ones (Barański et al. 2008, Czubska et al. 2009). This is due to genetic-environment interaction, as well as multi-environmental factors that have stronger than genetic effect on cow productivity (Sender et al. 1987, Dorynek and Kliks 1998, Litwińczuk et al. 2000, Matras et al. 2000, Sawa et al. 2000, Nałęcz-Tarwacka et al. 2002). As the main factor affecting the dairy performance of cows is the environment, to take full advantage of breeding value of cow in terms of production and health, genotype on the animal should be match with specific environmental conditions. On the other hand, the breed of cattle is known to have a huge impact on the composition of 6 M. Balcerak et al. milk. The most valuable breeds for chees producing plants are: Polish Red, Simmental, Montbeliarde and Brown Swiss (Barłowska et al. 2014, Malchiodi et al. 2014). Those breeds do not impress with quantity of produced milk, but in terms of the milk composition outperformed other popular breeds in Poland. The raw material obtained from these breeds had significant higher protein content in milk, particularly kappa casein fractions, which is very valuable for cheese production. Despite the obvious advantages of such milk its production is marginal in Poland due to the relatively small population of these breeds (Choroszy 1997). Many authors (Sablik et al. 2001, Czaplicka et al. 2002, Czaplicka et al. 2003, Puchajda et al. 2003, Bogucki et al. 2009, Cichołowicz et al. 2010) dealt with the comparison of milk performance of native and imported cows. However, those researches hasn’t clearly confirmed that imported heifers performed better than Polish ones. So it seems advisable to compare the milk performance of imported cows, with native ones in similar environmental conditions. The aim of the study was therefore confrontation milk recording data of cows originated from six European countries and Poland and demonstrate the differences within the different breeds. MATERIAL AND METHODS The study was conducted on 26 farms, involved in “Healthy Cow”. This project was initiated by the Dairy Cooperative “Spomlek” located in Radzyn Podlaski in 2011. The main objective of the program is to improve the health of animals, upgrade breeders skill, introduce the latest research results in the field of dairy farming and the economics into milk production. The “Healthy Cow” program cooperatives were: Veterinary Institute in Pulawy Polish Research Institute; Warsaw University of Life Sciences − SGGW, Department of Animal Sciences and the Polish Federation of Dairy Cattle Breeders and Producers. Research material consisted of data contained in dairy reports (RW-2) prepared by the Polish Federation of Dairy Cattle Breeders and Producers. The reports were gathered from 26 farms and totally involved 12,357 observations. In the statistical analysis fallowing variables were studied: milk yield and the content of the milk: fat, protein, lactose, solids, urea and somatic cells. The analyzed factors were: • the effect of the country of origin of animals on the results of milk performance as well the differences between particular countries; • the effect of the country of origin of animals on the level of urea and somatic cell count in milk; • the effect of the breed on the milk performance results; • the effect of breed on the level of urea, and the number of somatic cells. Statistical analysis was performed with IBM SPSS 21 (2013) software by the following GLM model (differences between means were estimated with the F test): Y = μ + KPi + KP1j + Rk + eijk where: μ – average general; KPi – country of origine (Austria, the Czech Republic, Denmark, Germany, France, the Netherlands, Poland); Influence of the breed and country of origin on milk performance of primiparous cows KP1j – imported, native; Rk – breed: Brown Swiss (BS), Back and White variety of Holstein-Friesian (HO), Red and White variety of Holstein-Friesian (RW), Norwegian Red (NR), Simental (SM); eijk – random error. RESULTS AND DISSCUSION Table 1 presents the effect of country of origin of the heifers on the milk performance. Heifers originated from six European countries including: Austria, the Czech Republic, Denmark, Germany, France, the Netherlands and Poland. As a result of analysis highly significant (p ≤ 0.01) the influence of heifers origin on their milk yield, and the percentage content of fat, protein and lactose was observed. The highest performance characterized by animals from France, which produced an average of 27.03 kg of milk a day. The lowest yield was reported in hefiers originating from the Netherlands, which produced 18.29 kg milk daily. Moreover, results reviled that imported animals generally produced more milk than native, except for heifers brought from the Netherlands (Table 1). Different results were obtained by Gnyp et al. (2006), who in his study found the highest dairy performance in animals imported from the Netherlands, and the lowest in French ones. Other results reported by Skrzypek and Szukalski (2006), confirmed the superiority of cows imported from Germany in terms of milk yield (21.25 kg/day) compared with Polish ones (21 kg/day) at the same age. In the study of Czaplicka et al. (2013) yield of cows imported from France was 7 at 14.43 kg of milk a day, in contrast to Polish Holstein-Friesian which produced only 12.92 kg of milk a day. On the other hand, according to Czarniawska-Piątkowska (2009), imported cows had lower milk yields than Polish cows domestic (native – 27.75 kg/day, imported – 27.54 kg/day). Similarly, in the study of Kuczaj (2004) heifers imported from the Netherlands, characterized by a lower productivity of milk (9.10 kg/ /day) than Polish HO and RW (12.02 and 11.7 kg/day, respectively). Also Gnyp et al. (2001) found higher milk yield (18.77 kg/day) of native cows compared with cows imported from Germany (14.54 kg milk yield). Similar results were reported by Antkowiak and Kliks (1998) and Zdziarski et al. (2002). Milk with the highest fat content derived from animals imported from the Netherlands (average 4.36%). Similar to Gnyp (2012), the obtained results confirmed the highest content of fat in heifer originated from the Netherlands. However, the highest protein content was found in milk of German cows (an average of 3.66%), and the highest content of lactose in milk of animals from France (an average of 4.95%). There was a significant influence on the country of origin of heifers on dry matter content in milk (Table 1). The dry matter content was the highest in milk of cows imported from France, and was 12.94% on average. The average fat content of milk from imported cows in the study was 4.09%. Comparing it with the average fat content of Polish population of HO reported by Polish Federation of Dairy Cattle Breeder and Producer in 2013, it was found that native cows have a higher fat content in milk (4.16%) compared to the Significance of the effect Average value 9099 72 Netherlands Poland 71 2112 Denmark 231 224 Czech Republic France 128 Austria Germany N Specification 0.16 0.22 0.87 0.47 0.75 0.34 0.47 0.84 SE P ≤ 0.01 21.72 19.88 18.29 27.03 25.49 24.06 24.09 23.61 LSM Milk (kg) 0.02 0.02 0.11 0.06 0.09 0.04 0.06 0.10 SE P ≤ 0.01 4.09 4.15 4.36 3.92 4.18 3.96 3.95 4.13 LSM Fat (%) 0.01 0.01 0.06 0.03 0.05 0.02 0.03 0.05 SE P ≤ 0.01 3.44 3.44 3.49 3.43 3.67 3.40 3.29 3.52 LSM Protein (%) 0.005 0.007 0.028 0.015 0.024 0.011 0.015 0.027 P ≤ 0.01 4.86 4.84 4.79 4.95 4.77 4.89 4.83 4.94 SE Lactose (%) LSM TABLE 1. The influence of country origin of primiparous cows on milk components 0.028 0.037 0.143 0.078 0.123 0.056 0.077 0.139 SE P ≤ 0.05 13.09 13.12 13.30 12.94 13.40 12.94 12.77 13.31 LSM Dry matter (%) 71.36 112.54 51.09 70.24 74.18 SE 172.58 206.04 211.26 200.43 214.33 LSM 25.10 34.11 P ≤ 0.01 283.13 310.14 1.85 2.52 P ≤ 0.01 191.01 177.91 9.66 5.28 8.33 3.78 5.20 9.37 SE Somatic cells count (103/l) 654.37 130.522 195.92 116.79 373.08 237.57 315.83 126.58 LSM Urea content (mg/l) Influence of the breed and country of origin on milk performance of primiparous cows imported ones. Similar observations was made by Gnyp et al. (2001). Mentioned above authors also confirmed higher fat content (4.16%) in Polish HO cows compared with cows imported from Germany (4.02%). Nevertheless, the papers published by Dymnicki and Reklewski (1999) and Czerniawska-Piątkowska (2009) reviled different results. These authors of these publications stated that imported cows were characterized by higher content of fat than cow native ones (4 vs. 3.82%, respectively). Our study reviled that, cows imported from Austria, Germany, Denmark and the Netherlands had an average fat content of the milk in the range of 4.0–4.9% of fat and cows from the Czech Republic and France range of 3.0–3.9% of fat. It is worth mentioning, that German cows characterized by the highest maximum level of fat in milk at range of 5.0–5.9% all analyzed cows. The studies presented by Dymnicki and Reklewski (1999) and Czerniakowska-Piątkowska (2009) indicated a similar to our study percentage of fat in milk of German cows. The results of Czaplicka et al. (2013) observed comparable to those obtained in the study percentage fat content in milk of cows imported from France (4.28%). The average concentration of protein in milk in our study was 3.44%. Other authors (Dymnicki and Reklewski 1999, Czaplicka et al. 2013) observed a similar protein content in milk of cows imported from France and Germany, the Polish HO cows and the same age in (3.38, 3.19%, respectively). However, different results were obtained by Czerniawska-Piątkowska (2009) in her research on comparison of production traits of Holstein-Friesian cows imported from 9 Germany and their Polish contemporaries. Mentioned author observed a higher protein content in milk of Polish cows (3.34%) compared to imported ones (3.37%). Dymnicki and Reklewski (1999) and Czaplicka et al. (2013) found that cows imported from France and Germany, produced similar to observed in the study, concentration of milk protein. In studies of Cichołowicz et al. (2010) Holstein-Friesian cows imported from Germany were superior for protein content (3.37%) if compared to cows originated from Sweden (3.28% protein). Our study also reviled that the country of cow origin, had significant effect (p ≤ 0.01) on the content of urea and somatic cells in milk (Table 1). The highest average content of urea in milk characterized by animals from the Netherlands (654.37 mg/l) and the lowest, the heifers imported from France (116.79 mg/l). Animals carrived from Austria were characterized by the highest average milk somatic cell count, which amounted to 214.33 103/l, while the lowest average somatic cell count was observed in animal from France – 172.58 103/l. In studies of Czaplicka et al. (2013) found that the heifers imported from France had higher levels of SCC in milk (248 103/l) than their contemporaries from Poland. Table 2 presents the comparison of the milk performance of imported and native cows. There was no statistically significant differences between those two groups. However, it is worth noting, that the imported animals clearly characterized by higher daily milk production (23.89 kg) if compared to the Polish contemporaries (19.88 kg). The chemical composition of milk in both groups is similar. Nevertheless, imported animals 517 130 Norwegian Red Simmental NS – non-significant. Significance of the effect Average value 431 Red and White Holstein-Friesian 10786 73 Brown Swiss Black and White Holstein-Friesian N Specification 0.16 0.60 0.48 0.44 0.18 1.09 SE P ≤ 0.01 21.72 18.02 20.41 21.25 23.77 24.48 LSM Milk (kg) 4.09 4.31 4.11 4.15 4.05 4.04 LSM NS Fat (%) 0.02 0.07 0.06 0.05 0.02 0.13 SE 0.01 0.04 0.03 0.03 0.01 0.07 SE P ≤ 0.01 3.44 3.51 3.50 3.38 3.43 3.57 LSM Protein (%) TABLE 2. The influence of primiparous cows breed on milk components Bread 0.01 0.02 0.01 0.01 0.01 0.03 SE P ≤ 0.01 4.86 4.99 4.79 4.91 4.84 4.97 LSM Lactose (%) 0.02 0.10 0.07 0.07 0.03 0.17 SE P ≤ 0.05 13.09 13.45 13.12 13.12 13.02 13.30 LSM Dry matter (%) 25.10 90.78 72.35 66.45 26.98 66.15 SE P ≤ 0.01 283.13 112.91 233.34 188.63 338.44 163.39 LSM Urea content (mg/l) 1.85 6.72 5.35 4.92 1.99 12.10 SE P ≤ 0.05 191.01 202.78 185.23 196.21 192.42 226.04 LSM Somatic cells count (103/l) NS NS 13.09 4.86 3.44 0.02 3.44 0.02 0.03 3.44 NS 0.01 4.84 0.01 0.01 4.88 NS 0.01 13.12 0.01 13.04 0.01 LSM SE LSM SE LSM SE NS 4.09 NS – non-significant. LSM NS 0.16 21.72 4.15 0.22 19.88 4.03 0.24 LSM SE 23.89 Imported primiparous 2838 cows Native primiparous 9099 cows Average value Significance of the effect N Specification NS 1.85 191.01 25.10 283.13 0.02 2.52 177.91 34.11 310.14 0.03 2.74 206.53 37.08 251.13 0.04 SE LSM SE Somatic cells count (103/l) LSM SE Urea content (mg/l) Dry matter (%) Lactose (%) Protein (%) Fat (%) Milk (kg) TABLE 3. Milk performance of imported and native primiparous cows 11 were characterized by a slightly higher level of somatic cells count. The average content of somatic cells in milk of imported animals was 206.53 103/l and native 177.91 103/l (Table 3). Analyzing the results in Table 3 it can be seen that the breed of cattle has a highly significant effect (p ≤ 0.01) on average daily milk yield. Among the breeds studied, the highest daily performance elements characterized by Brown Swiss race that produced 24.48 kg of milk per day, whereas marked by Simmental cows from which the daily obtained averaged just over 18 kg. Table 3 presents the effect of breed on the of milk performance results. The largest group of animals was represented by Black and White variety of HolsteinFriesian (10,786 cows), while the smallest was the Brown Swiss breed (presented by only 73 cows). The study also showed a highly significant (p ≤ 0.01) the impact of the breed of cattle on the protein and lactose concentration in milk (Table 3). The highest average protein content was reported in Brown Swiss milk. The milk obtained from Simmental and Norwegian Red and Polish cows contained 3.57, 3.51 and 3.50% protein respectively. Simmentals’ milk, as indicated by Neja et al. (2013), was characterized by the most preferred ratio of protein to fat content. According to Litwińczuk et al. (2006), milk obtained from Simmentals had the high content of the casein fraction, and had the most preferable technological value. The highest average lactose content was observed in Simmental milk (4.99%). Slightly lower, but also a high content of lactose was noticed in milk of Brown Swiss and Holstein-Friesian of Black and White variety. 12 M. Balcerak et al. In our study, there was no significant differences between the breeds in the milk fat content. Analyzing Table 3, can also be observed that the breed of animals had a significant influence on the dry matter content in the milk. The highest content of dry matter was observed in milk of Simmentals with the average of 13.45%. Study also reviled significant impact of cattle breed on the amount of urea in milk (p ≤ 0.01). The highest content of urea in milk was stated in milk of Black and White variety of Holstein-Friesian cows. Animals of this breed characterized by an average content of milk urea at 338.44 mg/l. 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Wet. 62 (02): 197–200, ZDZIARSKI K., GRODZKI H, NAŁĘCZ-TARWACKA T., BRZOZOWSKI P., PRZYSUCHA T., 2002: Wpływ systemu utrzymania i genotypu krów na długość ich użytkowania i życiową użytkowość mleczną. Zesz. Nauk. Przeg. Hod. 62: 29–35. 14 M. Balcerak et al. Streszczenie: Wpływ rasy i pochodzenia pierwiastek na wyniki ich użytkowości mlecznej. Celem badań było porównanie parametrów użytkowości mlecznej i składu mleka pierwiastek pochodzących z sześciu krajów europejskich z rówieśnicami utrzymywanymi w Polsce oraz wykazanie różnic między rasami. Materiał do badań stanowiły dane zawarte w raportach wynikowych z 26 gospodarstw. Analizowano takie dane, jak: wydajność mleka oraz zawartości tłuszczu, białka, laktozy, suchej masy, komórek somatycznych i mocznika w mleku. Na podstawie uzyskanych wyników stwierdzono, że kraj pochodzenia pierwiastek okazał się istotnym czynnikiem wpływającym na dobową wydajność mleka, procentową zawartość tłuszczu, procentową zawartość białka, procentową zawartość laktozy. Wpływ ten wykazano również na zawartość: suchej masy, mocznika i komórek somatycznych w mleku. Analizując wyniki użytkowości mlecznej pierwiastek importowanych z krajowymi, nie wykazano statystycznie istotnych różnic między obiema grupami. Rasa krów miała wpływ na dobową produkcję mleka, procentowe zawartości białka, laktozy i suchej masy, a także na zawartości mocznika oraz komórek somatycznych w uzyskiwanym surowcu. MS. received May 2015 Authors’ address: Marek Balcerak Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW 02-786 Warszawa, ul. Ciszewskiego 8 Poland e-mail: [email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 15–25 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Changes in cow’s milk composition and physical properties during the uninterrupted milking process EDWARD DYMNICKI1, MARCIN GOŁĘBIEWSKI2, AGATA WÓJCIK2, KAMILA PUPPEL2, BEATA KUCZYŃSKA2, EWA SOSIN-BZDUCHA4, TADEUSZ SZULC3 Department of Animal Science, Institute of Genetics and Animal Breeding, Polish Academy of Science Department of Cattle Breeding, Warsaw University of Life Sciences – SGGW 3 Department of Cattle Breeding and Milk Production, Wroclaw University of Environmental and Life Sciences 4 Departament of Animal Genetic Resources Conservation, National Research Institute of Animal Production 1 2 Abstract: Changes in cow’s milk composition and physical properties during the uninterrupted milking process. The chemical composition of milk determines the nutritional value and technological properties of milk and dairy products. Many studies have been performed on the chemical composition of milk, including fatty acid and protein profile, however a limited number of investigations have determined the changes in chemical composition of the milk during the milking process. Experiment were designed to study changes in milk chemical composition (i.e. fat, protein, casein, lactose, urea, citric acid, total solids – TS, solids-non-fat – SNF, free fatty acids – FFA, as well as acidity, density, freezing point and somatic cell score) during the uninterrupted milking. Fifty two cows (455 samples) of three different breeds; with daily production 5–12 kg; were sampled during interrupted milking process. Representative sample were collected from each kg of milked liquid. There were significant (P ≤ 0.01) changes in fat, FFA, lactose, TS and density of milk during milking. The concentration of fat, FFA, and TS shown increasing tendency with the course of milking, however, lactose and density presented opposite trends. Therefore, obtaining the whole quantity of milk from udder during the milking process, beside shaping the health status, is an indispensable step to produce milk of the highest quality in terms of its nutritional and technological value. Key words: milking process, milk composition, cow’s milk, fat INTRODUCTION Raw milk and dairy products are very important components of human diet in many part of the world. The chemical composition of raw milk determines the nutritional value and technological properties of milk and dairy products. Therefore, the chemical milk composition is of great importance for dairy industry and there is a great need for changing the composition of raw milk. Numerous studies have been carried out to investigate the influence of different factors on cow’s milk chemical composition (Glantz et al. 2009, Kuczyńska, 2011, Sakowski et al. 2012). The milk chemical composition strongly depends upon the season (Lindmark-Månsson et 16 E. Dymnicki et al. al. 2003, Lock and Garnsworthy 2003, Nałęcz-Tarwacka and Grodzki 2005), stage of lactation (Kuchtík et al. 2008, Puppel et al. 2012), feeding (Friggens et al. 2007, Kuczyńska et al. 2012), health status (Wielgosz-Groth and Groth 2003, Batavani et al. 2007) of the cow as well as and genetic factors (Fox and McSweeney 1998, Stoop et al. 2008a, Stoop et al. 2008b). Each milk compound can be affected by the same factors. When determining raw milk composition it is also important to realize the interaction between the feeding systems, management practices and breed (Heck et al. 2009). Over the last years, many studies have been performed on the chemical composition of milk, including fatty acid and protein profile (Wedholm et al. 2006, Soyeurt and Gengler 2008) as well as its influence on human health (Roche et al. 2001). However a limited number of investigations have determined the changes in chemical composition of the milk during the milking. Mostly, the fat fraction of milk have been investigated (Whittlestone 1953, Kernohan et al. 1971, Ontsouka et al. 2003), and other milk compounds have been rarely analyzed (Dobicki et al. 1993, Lollivier et al. 2002, Vangroenweghe et al. 2002). Typically, changes in cow’s milk constituents during the milking have been examined by analyzing certain fraction (e.g. beginning, middle and end of the milking) and not sampled during the whole milking process (Nielsen et al. 2005). Probably, the reason for that was the equipment limitation which not allowed to sample milk (e.g. representative sample of each liter of milk) during uninterrupted milking. Therefore, the aim of the study was to investigate changes in milk chemical composition during the uninterrupted milking. MATERIAL AND METHODS Animals and treatment Fifty two cows were used in the experiment of which 18 represented Polish Holstein-Friesian (PHF) breed; 17 to Polish Red (PR) and 17 to Polish Black and White (PBW) breed. The animals originated from two different farms: all PHF cows belonged to Institute of Technology and Life Sciences located in Falenty near Warsaw, PR and PBW belonged to Research Station of Organic Farming and Animal Breeding in Popielno. For the experiment purposed the chosen cows varied in terms of their productivity (5–12 kg of milk per milking). In both farms cows were housed in a tie stall system in accordance with standards of animal welfare developed by Polish Ministry of Agriculture and Rural Development. The lactation number as well as lactation stage differ within the group of studied cows; 2–4 lactation and 90–200 day in milk (DIM), respectively. Cows were milked twice a day. All cows were healthy and had continuous access to water. The cows were fed individually in accordance with their requirements, stage of lactation and physiological status. Feeding rations were balanced according to the INRA system (INRA 2009). The diet composition is presented in Table 1. The procedures involving animals were approved by the Local Commission for Animals Ethics concerning animal experimentation and care of experimental animals. Changes in cow’s milk composition and physical properties during the uninterrupted... 17 TABLE 1. Diet and chemical composition of the cow’ diet Treatmenta Item PHF cows 24.0 3.50 – – 0.7 0.1 0.14 Maize corn silage Corn silage Grass silage Hay Soybean meal (46% C.P.) Pasture ground chalk Premixa Salt Rapeseed meal Ground triticale Magnesium oxide Dry matter (% of DM) Ash (% of DM) Crude protein (% of DM) Acid detergent fiber (% of DM) Neutral detergent fiber (% of DM) Calcium (% of DM) Phosphorus (% of DM) Crude fiber (% of DM) UFL (% of DM · kg of DM–1) 0.05 2.0 – 0.05 Chemical composition 57.5 4.2 7.5 27.9 33.7 0.9 0.5 4.36 1.10 PR and PBW cows – – 30 6 – 0.1 0.05 0.02 – 1.5 – 67.2 6.45 5.75 33.7 41.6 0.7 0.6 4.56 1.16 a Contained (on 1000 g): Ca – 150 g, P – 100 g, Na – 50 g, Mg – 40 g, Zn – 9000 mg, Mn – 7000 mg, Cu – 1000 mg, J – 100 mg, Se – 50 mg, vitamin A – 1,200,000 IU, vitamin D3 – 120,000 IU, vitamin E – 5 000 mg, vitamin K – 93 mg, vitamin B1 – 80 mg, vitamin B6 – 160 mg, vitamin B2 – 110 mg, vitamin B12 – 1000 μg. C.P. – crude protein. Sampling Milk samples were collected between April and June of 2012 once from each of studied cow. All samples were collected from evening milking. Before collecting standard procedures of cow and udder preparing were maintained. The teats were cleaned with the cloth and the first squirt of milk was discarded. Before attaching milking tubes to udder milking cluster was connected to De Laval (Milkocsope MK II-KG-Scale) milk sampler. During the interrupted milking representative sample (50 ml) of milk from each kg of milked liquid was pooled out. As the milk yield of studied cows varied from 5 to 22 kg five to twenty samples were collected from each cow. The milk samples were placed in the sterile bottles containing milk preserver – Microtabs II (Bentley). Immediately after milking, samples were delivered to the laboratory of Institute of Genetics and Animal Breeding for chemical examination. Totally, 455 samples were collected. 18 E. Dymnicki et al. Chemical analysis The concentration of standard chemical compounds of the milk, i.e. fat, protein, casein, lactose, urea, citric acid, total solids (TS), solids-non-fat (SNF), free fatty acids (FFA), as well as acidity, density, freezing point and somatic cell score were determined by automated infrared analysis with a Milkoscan 6000 instrument (FossElectric). MilkoScan employs the FTIR measuring principle, in compliance with IDF and AOAC standards. Evaluation of somatic cell count (SCC) of the milk was proceeded on Fossomatic 5000 (Bentley). Than SCC was transformed to somatic cell score (SCS) by natural logarithm. Statistic analysis The data were performed to multi-factor analysis of variance (least square means) by IBM SPSS Statistics 19.0 software. The level of significance was set at P ≤ 0.05 or P ≤ 0.01. The model used to analyze influence of collecting number and milk yield on milk compounds was as follows: Yijk = μ + Ai + Bj + (Ai × Bj) + eijk where: Yijk μ Ai – dependent variable; – general mean; – effect of collecting (i = 1 – collected from 1st kg of milk, …, 12th and beyond 12th kg of milk); Bj – effect of yield (1–5 kg milking yield, …, 10 and beyond 14 kg milking yield); (Ai × Bj) – fixed interaction effect between collecting and yield; eijk – random error. To present the tendency in changes of milk components the exponential tendency line has been drown. Only chemical compounds of milk which were significantly affected by collecting and milking yield were the subject of further investigation. No effect of consequent sampling and milking yield on protein, casein, urea, citric acid, freezing point, acidity and somatic cell score was observed. RESULTS AND DISCUSSION The average production and milk composition of the cows is presented in Table 2. The fat concentration in raw milk of cows tend to change during the milking process (Fig. 1). The lowest level of fat was observed in milk at the beginning of milking, however the lowest value was noted in second collecting (from the 2nd kg of milk). The difference between the lowest and the highest level of milk fat was over 30 g·kg–1. The average increasing rate of raw milk fat fluctuated at 23 g·kg–1 per collecting. Whittlestone (1953), noted that fat content in fore milk was much lower than obtain in our study and was established at 16 g·kg–1 and in stripping milk was 89 g·kg–1. The author suggested that the trends towards increasing fat content during milking may be explained by the clustering of the fat globules as the consequence of the partial filtration of the globule clusters as the milk flows from the glands. There was significant (P ≤ 0.01) influence of the milk production on fat concentration in raw milk (Fig. 2), however the tendency was unclear. It is well known that there is the negative correlation between the fat concentration and Changes in cow’s milk composition and physical properties during the uninterrupted... 19 TABLE 2. The mean values for analyzed traits Trait Milk (kg) Fat (g·kg–1) Protein (g·kg–1) Casein (g·kg–1) Lactose (g·kg–1) Total solids, TS (g·kg–1) Solids-non-fat, SNF (g·kg–1) Urea (mg·1–1) Citric acid (g·kg–1) Freezing point (m°C) Fry fatty acids (mmol·100 g–1) Density (g·cm–3) Acidity (°SH) Somatic cell score (ln SCC·10–3) N 455 438 438 284 438 438 284 438 284 284 284 284 284 154 Mean 10.19 41.2 32.0 23.5 47.9 128.7 89.3 217.97 1.91 584.35 0.93 1.026 19.95 4.97 SD 4.21 15.9 4.7 2.9 2.8 16.2 4.0 73.12 0.49 20.70 0.79 0.002 5.02 1.15 Min 5.00 5.0 22.5 13.1 3.5 91.7 76.3 63.00 0.01 545.00 0.01 1.017 12.00 2.40 Max 22.00 113.9 43.6 31.3 53.9 189.6 98.9 478.00 2.90 702.00 4.91 1.034 38.00 8.65 60 55 50 fat [g⋅kg−1] 45 40 fat trend line 35 30 25 20 1 2 3 4 5 6 7 8 9 10 11 12 collecng FIGURE 1. Changes in fat concentration during milking milk production (Gaydarska et al. 2001), however some authors have found opposite relation (Chaunan and Hayes 1991). The highest level of milk fat was observed in milk of cows producing 7 kg of milk a milking and the lowest in milk of high yielding cows (above 14 kg of milk per milking). The difference between the highest and the lowest level was over 10 g·kg–1. 20 E. Dymnicki et al. 48 46 44 fat [g⋅kg−1] 42 40 fat trend line 38 36 34 32 5 6 7 8 9 10 11 12 13 >14 milk [kg] FIGURE 2. Influence of the milking yield on fat concentration in cow’s milk Whittlestone (1953), confirmed that the rise in fat percentage is the greatest in cows producing a large amount of milk, or milking with long intervals. Moreover, he stated that the increase in fat content results mainly from the increased number of milk fat globules. Results obtained by Dobicki et al. (1993), shown that fat content was 2.88 and 5.79% at the milk yield of 6 kg and 1.92 and 6.71% at the milk yield 12 kg (in the single milking – the first and the last liter of milk, respectively). According to Lollivier et al. (2002), the concentration of milk fat increases with the course of milking; milk removed at the beginning of a milking, corresponding to the cisternal milk, is less rich in milk fat than milk removed at the end of milking, corresponding to the alveolar milk. The explanation of the phenomenon revealed Guinard-Flament et al. (2001), who stated, that milk fat globules are transferred from the alveoli to the cistern during machine milking as a result of oxytocin-mediated milk ejection. An interesting results reported Froberg et al. (2007) who observed low fat content in milk of suckler cows after isolation or weaning of their calves. Dymnicki and Sosin-Bzducha (2012), reported that milk of PR cows milked mechanically after 12 hours of their calves isolation characterized by a very low fat content (0.55–0.87%) depending on the lactation stage. Similar results obtained Combellas and Tesorero (2003), and Marin et al. (2007). Similar to fat concentration tendencies of free fatty acids changes in milk during milking were stated (Fig. 3). The increasing rate was equal to 0.04 mmol·100 g–1 of fat. However, the higher than in fat content variation in the concentration of FFA was observed. The pick of the FFA concentration was reported at the 11th collection and its lowest level at 2nd collecting (79% between extremes). Changes in cow’s milk composition and physical properties during the uninterrupted... 21 2.50 −1 free faƩy acids [mmol⋅100 g ] 2.00 1.50 free faƩy acids 1.00 trend line 0.50 0.00 1 2 3 4 5 6 7 8 9 10 11 12 collecƟng FIGURE 3. Changes in free fatty acids concentration during milking The level of lactose in milk of studied cows was strongly affected by collecting number (Fig. 4). The changes in lactose concentration during milking can be compared to shape of the standard lactation curve and the tendency line was opposite to that observed in fat. The highest level of lactose was observed in 2nd kg of milk (2nd collection) and the lowest at 12th collection. Difference 50 49 −1 lactose [g⋅kg ] 49 48 48 lactose trend line 47 47 46 46 1 2 3 4 5 6 7 8 9 collecƟng FIGURE 4. Changes in lactose concentration during milking 10 11 12 22 E. Dymnicki et al. Total solids concentration in milk during milking was changed (P ≤ 0.01) with following collection (Fig. 5). The highest level was observed at 11th sample and the lowest at the 2nd with the difference between ambivalent values equal to 29.8 g·kg–1. Clear increasing tendency for TS content during milking was noted (increasing rate – 0.2 g·kg–1). The highest density was observed at the beginning of milking and the its lowest value at the end of the process (Fig. 6). However, the difference between the highest and the lowest values were small and equal to 1.06 g·cm–3. The tendency of raw milk density changes were similar to those observed in lactose concentration. Decreasing rate was equal to 0.21 g·cm–3 per collecting. The results of the research shown linear relationship between consequent sample of milk and concentration of milk components. Fat, free fatty acids, total between extremes was fluctuated at 3.0 g·kg–1. With the course of milking lactose level in raw milk dropt with the rate of 0.2 g·kg–1 per collecting. The results of other authors differed significantly. According to Dobicki et al. (1993) and Bruckmaier et al. (2004) there were no differences in percentage of protein and lactose between the first and the last squirts of milk during the milking. However Vangroenweghe et al. (2002) observed that the lactose and protein content in raw milk was lower in post-striping compared to fore milk. Moreover, lactose concentration also strongly depends upon the health status of mammary gland and is synthesized exclusively by udder epithelial cells. In case of mastitis lactose partially leaks into blood circulation through the damaged blood vessels and its concentration in milk decreases (Bruckmaier et al. 2004). 150 145 −1 Total solids [g⋅kg ] 140 135 130 total solids trend line 125 120 115 110 1 2 3 4 5 6 7 8 9 10 11 12 collecƟng FIGURE 5. Changes in dry matter total solids concentration during milking Changes in cow’s milk composition and physical properties during the uninterrupted... 23 0.001 0.001 −3 density [g⋅cm ] 0.001 0.001 density 0.001 trend line 0.001 0.001 0.001 1 2 3 4 5 6 7 8 9 10 11 12 collecƟng FIGURE 6. Changes in milk density during milking solids contents were increasing, lactose decreasing and protein content shown no changes. 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STOOP W.M., Van ARENDONK J.A.M., HECK J.M.L., Van VALENBERG H.J.F., BOVENHUIS H., 2008b: Genetic parameters for ma- Changes in cow’s milk composition and physical properties during the uninterrupted... jor milk fatty acids and milk production traits of Dutch Holstein friesians. J. Dairy Sci. 91: 385–394. VANGROENWEGHE F., DOSOGNE H., BURVENICH C., 2002: Composition and milk cell characteristics in quarter milk fractions of dairy cows with low cell count. Vet. Journal 164: 254–260. WEDHOLM A., HALLÉN E., LARSEN L.B., LINDMARK MÅNSSON H., KARLSSON A.H., ALLMERE T., 2006: Comparison of milk protein composition in a Swedish and a Danish dairy herd using reversed phase HPLC. Acta Agric. Scandinavica, Sect A 56: 8–15. WHITTLESTONE W.G., 1953: Variation in the fat content of milk throught the milking process. J. Dairy Sci. 20: 146–153. WIELGOSZ-GROTH Z., GROTH I., 2003: Effect of the udder health on the composition and quality of quarter milk from black and white cows. Electronic J. Polish Agric. University 6 (2): 2–5. nym mleka (czyli tłuszcz, białko, kazeina, laktoza, mocznik, kwas cytrynowy, sucha masa – s.m., sucha masa beztłuszczowa – s.m.b., wolnych kwasów tłuszczowych – FFA oraz kwasowość, gęstość, punkt krzepnięcia i liczba komórek somatycznych) podczas nieprzerwanego doju. Badania przeprowadzono na 52 krowach (3 różnych ras) o średniej dziennej produkcji mleka wynoszącej 5–12 kg. Ogółem pobrano 455 próbek mleka. Reprezentatywne próbki pobierano z każdego kolejnego udojonego kilograma mleka. Stwierdzono istotne (P ≤ 0,01) zmiany w zawartości tłuszczu, FFA, laktozy, TS i gęstości mleka podczas dojenia. Koncentracja tłuszczu, FFA i TS wykazały tendencję wzrostową w trakcie dojenia, jednak laktoza i gęstość wykazały trend odwrotny. Pozyskanie całej ilości mleka z wymion podczas procesu dojenia, obok kształtowania stanu zdrowia, jest więc niezbędnym krokiem w kierunku produkcji mleka najwyższej jakości pod względem jego wartości odżywczej i technologicznej. MS received May 2015 Streszczenie: Zmiany w składzie mleka krowiego podczas nieprzerwanego doju. Skład chemiczny mleka określa wartość odżywczą i właściwości technologiczne mleka i produktów mlecznych. Przeprowadzono wiele badań dotyczących składu chemicznego mleka, profilu kwasów tłuszczowych i zawartości białek. Jednak istnieje mało badań, które dotyczyłyby zmian w składzie chemicznym mleka w trakcie procesu dojenia. Celem badań było określenie zmian w składzie chemicz- 25 Authors’ address: Marcin Gołębiewski Zakład Hodowli Bydła Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW 02-786 Warszawa, ul. Ciszewskiego 8, Poland e-mail: [email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 27–36 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Relation between the shape and course of lactation curve and production traits of Polish Holstein-Friesian and Montbeliarde cows MARCIN GOŁĘBIEWSKI, TOMASZ PIOTROWSKI, PIOTR BRZOZOWSKI, HENRYK GRODZKI, TOMASZ PRZYSUCHA, JAN SLÓSARZ, MAŁGORZATA KUNOWSKA-SLÓSARZ, TERESA NAŁĘCZ-TARWACKA, AGATA WÓJCIK Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Abstract: Relation between the shape and course of lactation curve and production traits of Polish Holstein-Friesian and Montbeliarde cows. The aim of the study was to examine the relation between shape and course of lactation curve and production traits of Polish Holstein-Friesian (PHF) and Montbeliarde (MO) cows kept under various production systems. The production parameters were based on cows records developed by Polish Federation of Cattle Breeders and Producers and involved 1374 lactations. For estimation of lactation curve parameters Wood’s model was applied. The influence of breed, lactation number and type of the farm on Wood’s parameters were analyzed. The relations between shape and curse of the lactation curve on daily production and milk chemical composition were investigated. Analysis revealed that standard shape of the lactation curve was the most often observed, the significantly higher frequency was observed in MO than PHF cows. Cows with standard lactation curve characterized by the highest production and the best milk quality. The significant influence of breed, lactation number and farm type on Wood’s parameters were stated. Cow with less dynamic changes in milk production during lactation characterized by significantly better production parameters. Key words: lactation persistency, lactation curve shape, production traits, dairy cow, Montbeliarde breed, Polish Holstein-Friesian breed INTRODUCTION The lactation persistence of dairy cows, measured by the level and rate of daily milk production decreasing after the peak of lactation, plays a important role in economics of milk production (Togashi and Lin 2009). The slower milk decline during the lactation the beneficial economic effect. The difficulties of comparing the lactation persistence of cows in various studies are mainly due to different ways of defining this parameter (Gengler 1996, Swalve and Gengler 1999). The lactation persistence can be presented in three ways: as a uniform rate of lactation (Gengler and Misztal 1996), on the basis of milk records (Gengler and Misztal 1996, Grossman et al. 1999) and by setting the parameters of mathematical models of lactation curves (Rowlands et al. 1982, Goodal and Sprevak 1984, Leon-Velarde et al. 1995). According to Grossman et al. (1999), the first two ways of defining the lactation persistence are vague, hence the great interest of researchers in finding mathematical model describing lactation curve that precisely describe the distribution of 28 M. Gołębiewski et al. the daily milk records of lactating cows. Mostly, for these purposes, in scientific literature gamma function of lactation curves developed by Wood was applied (1967, 1976). Cows with flat lactation curve characterized by higher feed efficiency, better withstand high milk production at the peak of lactation (Muir et al. 2004, Weller et al. 2006), are more resistant to diseases (Jakobsen et al. 2002, Harder et al. 2006), characterized by better fertility (Bar-Anan and Ron 1985, De Vries 2006), thus tend to generate higher revenue (Dekkers et al. 1998). Despite the great importance of lactation perseverance, this feature is often not taken into account in the merit indexes. The reason for this may be the lack of adequate data to estimate its economic weight and the difficulty in assessing the influence of the effect of lactation persistence on other functional traits. Recently, with the growing interest in methods that use data on test day records, the more popular have become the procedures for lactation persistence (lactation curve) assessment in animal breeding programs (Schaeffer and Dekkers 1994, Jamrozik et al. 1997). The aim of this study was to determine the relationship between the shape and course of the lactation curve and the and production traits of Polish Holstein-Friesian and Montbeliarde cows kept under various production systems. MATERIAL AND METHODS The material consisted cows of Polish Holstein-Friesian of Black and White variety (PHF) and Montbeliarde (MO) from six dairy farms located different regions of Poland. All farms were divided into two groups with regard to herd size, production system and the intensity of production. Data were recorded by the Polish Association of Cattle Breeders and Milk Producers (PFHBiPM), and each of the stocks covered by the milk performance was controlled by AT4. Herds differed size and intensity of production, and all of them were two races held at the same time (the exception was only one herd of cows term montbeliarde). In total, the study analyzed 1374 lactations (967 PHF and 407 MO). For statistical analysis, the data from the daily performance reports, consisted: 1. Basic identification data of each studied cow, i.e.: tag number, breed, herd number, birth data and culling data; 2. Performance information of studied cows, i.e.: milk production, fat, protein, lactose, urea and dry matter concentration, somatic cell count. In addition to standard production traits, the FCM (fat corrected milk) and ECM (energy corrected milk) were calculated according to the formulas: FCM = 0.4 M × 15 F ECM = 0.25 × M + 12.2 × F + 7.7 × P where: M – milk (kg); F – fat (kg); P – protein (kg). 3. Analysis of lactation curve shape was based on Wood’s model parameters: Yn = anbe–cn where: Yn – average daily yield in the n-th week; Relation between the shape and course of lactation curve and production traits... a b c n – parameter describing general production ability related to peak lactation; – parameter related to the ascending part of the curve between calving and peak of lactation; – parameter related to the descending part of the curve following lactation peak; – week of the lactation (Wood 1967). Wood function parameters were calculated according to Gauss-Newton method (Hartley 1961). Since a non-linear form of regression does not guarantee convergence, Wood’s function was transformed to its logarithm form: ln Yn = ln (a) + b ln (n) – cn. Wood’s model can fit analyzed traits curves in four different shapes (Wood 1976, Macciotta et al. 2005), mainly depending on the value of parameters b and c, as a is always positive and influences average level of production (Table 1). Type C1 represents the shape of the typical curve of daily milk yield while C2 and C3 correspond to continuously increasing and decreasing curves, respectively. The type C4 refers to the TABLE 1. Possible curve shapes of Wood’s model (Gołębiewski 2010) Curve shape Parameters of Wood’s model b c C1 b>0 c<0 C2 b>0 c>0 C3 b<0 c<0 C4 b<0 c>0 Curve description standard lactation curve continuously ascending curve continuously descending curve inverted to standard curve 29 shape of reversed standard curve, with a descending initial phase and ascending phase after reaching the minimum (Gołębiewski 2010). Goodness of fit was estimated by the adjusted determination coefficient (R2) (Olori et al. 1999, Macciotta et al. 2005). Scripts were written in Visual Basic using Solver in MS Excel and run in order to calculate parameters of Wood’s model. For the statistical analysis PAWS Statistics 19 (2010), software package was applied. To compare the distribution of lactation curves types of the of cows of both breeds Chi2 test was used. The analysis of variation (ANOVA) of SPSS software package was used to evaluate breed (MO and PHF), production intensity (1 – intensive and 2 – less intensive), lactation number (first, second, third, fourth and more) on coefficients of Wood’s model according to model 1, which is: Y = μ + Ai + Bj + Ck + (Ai × Bj) + + (Ai × Ck) + eijkl where: μ – mean; Ai – breed (1 – MO; 2 – PHF); Bj – lactation number (1 – first, 2 – second, 3 – third, 4 – fourth and more); Ck – production intensity (1 – larger herds, intensive production system; 2 – smaller herds, moderate production intensity); Ai × Bj – interaction between breed and lactation; Ai × Ck – interaction between breed and production intensity; eijkl – random error. 30 M. Gołębiewski et al. During the statistical analysis of the production parameters of studied cows also influence of the shape of the lactation curve on the analyzed traits was performed according to model 2, which is: Y = μ + Eh + eh where: μ – mean; Eh – lactation curve shape (1-C1; 2-C3; 3-C4); eijkl – random error. Due to the incidental occurrence C2 curve was omitted in further analysis. To evaluate impact of the production parameters on dynamics of parameters b and c of Wood function model 3 were applied in a form: Y = μ + Fg + Gt + eijkl where: μ – mean; Fg – parameter b (1) ≤ 0; (2) 0–0.5; (3) > 0.51); Gt – parameter c (1) ≤ –0.25; (2) –0.249–0.3; (3) > 0; eijkl – random error. In order to determine the direction and strength of the relationship between parameters b and c of the Wood model and the production traits Pearson correlations were calculated. RESULTS AND DISCUSSION Distributions of the different types of lactation curves of the MO and PHF breeds are shown in Table 2. There was a significant (P ≤ 0.05) differences between both breeds in report to lactation curves distributions. The most frequently observed type of lactation curve was standard lactation curve (1), which occurred in 73.9% cows. Similar results obtained Olori et al. (1999). Marcciotta et al. (2005), reported 80 and 17% frequencies of types C1 and C4, respectively. The standard shape of the lactation curve, illustrating the daily changes in milk yield, was observed more frequently in MO than PHF cows (of more than 7 percentage points). Other types of curves occurred less frequently: type 3 (16.8%) and type 4 (9.2%). Significant differences between breeds were reported only during statistical analysis of type 3 of lactation curve. The PHF cows were characterized by a 6.4 percentage point higher frequency of the type 3 of lactation curve. The effect of breed on the development of Wood’s model parameters was studied (Table 3). Statistically significant differences between the breeds were observed for the all analyzed parameters. PHF cows were characterized by a 3.269 kg higher (P ≤ 0.01) daily milk production (the parameter a). Similar results observed Gołębiewski (2010). However, MO cows had faster dynamic of production to the lactation peak and more rapid decline after reaching maximum capacity (respectively parameters b and c of Wood’s model). The differences between the breeds were 0.105, 0.025 respectively for parameters b and c with comparable level of the determination coefficient (R2). Olori et al. (1999) observed great proportion of lactation curves with R2 ≥ 0.75. Table 4 presents the effect of the intensity of production on the parameters of Wood’s model. It was noted (P ≤ 0.01) higher values of the parameter a (3.614) Relation between the shape and course of lactation curve and production traits... 31 TABLE 2. Distribution of the lactation curve types in Polish Holstein-Friesian and Montbeliarde cows Curve shape PHF 694 1 181 91 967 1 2 3 4 Total Breed % 68.4 100.0 78.4 71.7 – MO 321 0 50 36 407 % 31.6 0.0 21.6 28.3 – Total PHF and MO 1015 1 231 127 1374 % 73.9 0.1 16.8 9.2 100.0 Chi2 ≤ 0.05; 1 – standard; 2 – ascending; 3 – descending; 4 – inverted. TABLE 3. Influence of the breed of cow on Wood’s model parameters Breed Parameter a b c R2 N 967 967 967 967 PHF Mean 31.943** 0.228** –0.121** 0.718* SE 0.326 0.014 0.004 0.007 N 407 407 407 407 MO Mean 28.674** 0.333** –0.146** 0.693* Total SE 0.522 0.023 0.007 0.012 N 1374 1374 1374 1374 Mean 30.975 0.259 –0.129 0.711 SE 0.280 0.012 0.003 0.006 a – parameter describing general production ability related to peak lactation; b – parameter related to the ascending part of the curve between calving and peak of lactation; c – parameter related to the descending part of the curve following lactation peak; R2 – determination coefficient; * significance at P ≤ 0.05; ** significance at P ≤ 0.01. TABLE 4. Influence of the production intensity on Wood’s model parameters Production intensity Parameter a b c R2 N 233 233 233 233 1 Mean 33.976** 0.317* –0.159** 0.726 SE 0.728 0.036 0.010 0.013 N 1141 1141 1141 1141 2 Mean 30.362** 0.247* –0.122** 0.708 Total SE 0.299 0.012 0.003 0.007 N 1374 1374 1374 1374 Mean 30.975 0.259 –0.129 0.711 SE 0.280 0.012 0.003 0.006 1 – intensive production; 2 – less intensive production; a – parameter describing general production ability related to peak lactation; b – parameter related to the ascending part of the curve between calving and peak of lactation; c – parameter related to the descending part of the curve following lactation peak; R2 – determination coefficient; * significance at P ≤ 0.05; ** significance at P ≤ 0.01. defining the overall productivity for type 1 of farm, which is characterized by a higher intensity of production, nutrition and free-stall production system. Cows kept in this system were also characterized by a faster growth of curve (P ≤ 0.05) in the initial phase of lactation and the (P ≤ 0.01) more rapid decrease (0.037) in its final stage, than cows kept in farms with lower production intensity, a – parameter describing general production ability related to peak lactation; b – parameter related to the ascending part of the curve between calving and peak of lactation; c – parameter related to the descending part of the curve following lactation peak; R2 – determination coefficient; 1, 2, 3, 4 and more – lactation numbers; * significance at P ≤ 0.01. 0.003 0.006 0.711 –0.129 1374 1374 0.034 0.028 –0.133 0.707 33 33 0.009 0.011 0.768* –0.155* 281 281 0.01 0.007 –0.142* 0.774* 356 356 704 0.009 –0.111* 704 c R2 0.656* 0.275 704 b 0.004 0.012 0.259 30.975 1374 1374 0.1 1.811 38.472* 0.15 33 33 0.611 0.029 0.287 36.378* 281 281 0.023 0.527 36.106* 0.217 356 356 25.872* 704 a 0.29 Se Mean N Se Mean N 0.015 Mean N Mean Se N Mean Se N Total (n = 1374) 4 and more n = 33 3 (n = 281) Lactation 2 (n = 356) 1 (n = 704) Parameter TABLE 5. Influence of the lactation number on Wood’s model parameters 0.295 M. Gołębiewski et al. Se 32 traditional feeding and tie-stall system. The determination coefficient (R2) did not differ significantly in both types of farms. Also Gołębiewski (2010), confirmed that cows kept under intensive production system characterized by higher milk production. When analyzing the effect of the lactation number on Wood’s model parameters (Table 5) study revealed that the value of the parameter a for the cows in first lactation were lower (P ≤ 0.01) from lactating cows at second, third, fourth and further lactations (by 10.234, 10.506, 12.600 respectively). It was also found lower value of the parameter c of primiparous versus cows at second and third lactation (0.031 and 0.44 at P ≤ ≤ 0.01 respectively), what was probably caused by better lactation persistency of younger cows. Similarly, the R2 value was lower at first than at second and third lactation (0.118 and 0.112 respectively). There were no significant differences in the values of the parameter b between different lactations numbers. There was no relation between lactation curve and performance parameters in standard lactation. The best production parameters, such as: milk, FCM, ECM, fat, protein, lactose and dry matter, were characterized by a cow with lactation curve opposite to the standard curve (type 4) however the values were very similar to those obtained by the cows standard (type 1) lactation curve. Cows with a standard lactation curve characterized by the highest concentration of chemical components of milk, excluding protein content which reached the highest value at cows with a decreasing lactation curve (type 3). Relation between the shape and course of lactation curve and production traits... Different results were observed during the analysis of the relationship between the shape of the lactation curve, and the performance parameters based on the daily records (Table 6). Significant differences in daily milk yield were reported between cows characterized by curves of types 1 and 4 (1.691), and types 3 and 4 (1.548). Cows with a standard curve (type 1) had the highest daily production. The number of somatic cells (P ≤ 0.01) differ between cows characterized by a different course of lactation curve, and was the lowest for type 1 (611.070), and the difference between types 1 and 3 and types 1 and 4 were 127.56 and 139.39 respectively. Lactation curve type had an influence (P ≤ 0.05) on the percentage of protein in milk. The highest protein content were reported in milk produced by cow characterized by standard lactation curve (3.484) and the lowest in milk of cows with type 4 of lactation curve (3.378). There was no relation between of lactation curve shape and concentration of fat, lactose, dry matter and urea in milk. 33 Table 7 presents the relationship between the dynamics of lactation curve changes, and the performance parameters based on test day records. There was a significantly higher daily yield of cows with a moderate increase in the initial phase of lactation (parameter b) compared with the cows characterized by rapid increase of the milk production before the lactation peak. Cows with moderate value of parameter b (2) also characterized by a higher content of fat, protein, lactose and dry matter in milk than cows from the first group (P ≤ 0.01), as well as lower somatic cells count in milk (P ≤ 0.01), and the highest urea levels compared with cows of fast (1) and slow (3) growth rate of the lactation curve. Cows characterized by the smallest value of parameter b characterized by the (P ≤ 0.01) the highest percentage of protein content (3.558) and the lowest level of urea in milk (230.62) compared to the cows of the other groups (1.2). Analyzing the lactation curve declining rate at the final phase of lactation (parameter c) the dominance of cows with moderate decrease rate (2) on other TABLE 6. Relation between lactation curve shape and production traits of cows based on test day records Curve shape Trait Milk (kg) Fat (%) Protein (%) Lactose (%) Dry matter (%) Somatic cell count (K/ml) Urea (mg/l) N 1015 989 1015 1015 1015 1 Mean 23.069* 3.904 3.484** 4.938 13.322 SE 0.169 0.042 0.016 0.008 0.023 N 231 229 231 231 231 3 Mean 22.926* 3.922 3.433** 4.952 13.307 SE 0.350 0.088 0.033 0.014 0.045 N 127 126 127 127 127 1015 611.070* 25.964 231 738.630* 58.593 127 1015 232.360 231 246.210 127 2.067 * significance at P ≤ 0.01; ** significance at P ≤ 0.05. 4.409 4 Mean 21.378* 3.727 3.378** 4.976 13.268 SE 0.493 0.132 0.043 0.014 0.066 750.460** 74.114 240.730 6.495 34 M. Gołębiewski et al. TABLE 7. Influence of the dynamics of lactation curve changes on milk production Parameter Trait N 1 Mean SE N b 2 Mean SE N 3 Mean SE N 1 Mean SE N c 2 Mean SE N 3 Mean SE Milk (kg) Fat (%) Protein (%) Lactose (%) Dry matter (%) Somatic cell count (K/ml) Urea (mg/l) 360 357 360 360 360 360 360 22.367** 0.286 661 23.262** 0.209 353 22.72 0.286 509 22.554** 0.239 737 23.38* 0.196 128 21.383** 0.489 3.852 0.073 649 3.941 0.051 339 3.833 0.077 492 3.878 0.063 726 3.927 0.048 127 3.729 0.131 3.414* 0.026 661 3.443* 0.019 353 3.558* 0.026 509 3.558* 0.022 737 3.417* 0.018 128 3.375* 0.043 4.961 0.01 661 4.94 0.009 353 4.935 0.013 509 4.933 0.011 737 4.946 0.008 128 4.977 0.013 13.292 0.037 661 13.304 0.028 353 13.357 0.04 509 13.389* 0.033 737 13.271* 0.026 128 13.266 0.065 739.68* 45.788 661 583.79* 28.179 353 663.21 52.754 509 706.8** 44.446 737 584.94** 25.905 128 745.52** 73.699 244.34* 3.64 661 248.8* 2.614 353 230.62* 3.308 509 229.75* 2.829 737 252.27* 2.434 128 241.88 6.544 b, c – parameters of Wood’s model; 1, 2, 3 – dynamics of lactation curve changes; * significance at P ≤ 0.01; ** significance at P ≤ 0.05. groups (1 and 3) for the majority of production parameters was observed. These cows produced more milk (P ≤ 0.01) from cows with high (1) and small (3) values of parameter c. Milk obtained from these cows was characterized by a high content of fat, had significantly lower levels of somatic cells count as well (P ≤ 0.01) as the highest level of urea than animals from other groups. Cows with the fast declining rate (1) of lactation curve at the end of lactation were characterized higher milk production (P ≤ 0.05), the highest concentration of protein in milk (3.558) and dry matter (13.389) than cows of group 3 (P ≤ 0.01). There was no significant correlation between the Wood’s model parameters and production traits in standard lactation. However a significant (P ≤ 0.01) correlations were reported between the parameter b and the percentage of protein (0.105) in milk based on daily test records (Table 8). Moreover, negative correlation was observed between the level of urea in the milk of the parameter b (–0.067). The parameter c (P ≤ 0.01) was negatively correlated with the percentage of protein content (–0.182) and dry matter (–0.098) in milk. There was also a negative correlation (P ≤ 0.05) between the parameter c and the number Relation between the shape and course of lactation curve and production traits... TABELA 8. Correlations between Wood’s model parameters and milk production traits (mean values) Parameter b c Milk (kg) –0.005 0.022 Fat (%) –0.017 –0.001 Protein (%) 0.105** –0.182** Lactose (%) –0.014 0.043 Dry matter (%) 0.037 –0.098** Somatic cell count (K/ml) 0.003 –0.058* Urea (mg/l) –0.067* 0.0143** * significance at P ≤ 0.05; ** significance at P ≤ 0.01. of somatic cells count (–0.058). Study reveled that correlation between the urea content and parameter c of Wood’s model remained at 0.0143. CONCLUSION Irrespectively to cow’s breed, the most frequently type of lactation curve was standard lactation curve. 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Dairy Sci. 89: 2738–2746. WOOD P.D.P., 1967: Algebraic model of the lactation curve in cattle. Nature 216: 164–165. WOOD P.D.P., 1976: Algebraic models of lactation curves for milk, fat and protein production, with estimates of seasonal variation. Animal Production 22: 35–40. Streszczenie: Zależność między kształtem oraz przebiegiem krzywej laktacji a cechami produkcyjnymi krów rasy polskiej holsztyńsko-fryzyjskiej i montbeliarde. Celem pracy było określenie zależności między kształtem i przebiegiem krzy- wych laktacji a kształtowaniem się parametrów produkcyjnych w stadach krów rasy PHF i MO w różnych systemach utrzymania. Wskaźniki produkcyjne analizowanych stad opracowano na podstawie wyników oceny użytkowości mlecznej, które obejmowały 1374 laktacje. Do obliczenia parametrów krzywej laktacji wykorzystano model Wooda. Analizowano wpływ rasy, laktacji oraz typu gospodarstwa na kształtowanie się parametrów modelu Wooda. Badano również zależność między kształtem i przebiegiem krzywej a produkcją i składem chemicznym mleka w próbnych udojach. W przeprowadzonych badaniach stwierdzono, że najczęściej występującym typem krzywej była krzywa standardowa, która wykazała większą częstotliwość krów rasy MO niż PHF. Standardowy przebieg krzywej laktacji gwarantował największą produkcję i jakość mleka badanych krów. Stwierdzono istotny wpływ rasy, laktacji oraz typu gospodarstwa na kształtowanie się parametrów modelu Wooda. Krowy charakteryzujące się mniej dynamicznym przebiegiem laktacji charakteryzowały się istotnie lepszą produkcyjnością laktacyjną. MS received May 2015 Authors’ address: Marcin Gołębiewski Zakład Hodowli Bydła Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW 02-786 Warszawa, Ciszewskiego 8, Poland e-mail: [email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 37–43 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow’s milk during grazing season BEATA KUCZYŃSKA, KAMILA PUPPEL, TERESA NAŁĘCZ-TARWACKA, MARTA CZUB Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Abstract: Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow’s milk during grazing season. The aim of this study was to determine variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow’s milk during the grazing season. The study was carried out in 10 certified organic farms The major criterions of choosing organic farms to the experiment were as follows: obtaining certificate for at least five years and abidance of the organic farming standards, possessing a herd of Black and White Polish Holstein-Friesian cows (numbering more than 30 cows). The highest concentrations of CLA cis9, trans11 isomer, TVA and LA in milk fat has been reported in June, slightly lower in July and August. While the lowest level has been recorded in May, at the beginning of grazing period. Significant correlations between MUFA and SCD (r2 = = 0.828, P < 0.01) has been recorded. We concluded, that monitoring of SCD activity can be used as a tool to achieve high unsaturation of milk fat, during grazing period. Key words: CLA, SCD, TVA, LA, grazing, bovine milk INTRODUCTION In recent years, scientific and public interest are relating with nutritional quality of milk, which play significant role in maintaining of human health. Milk and milk products are desirable and valuable source of food. The nutritional quality of dairy products is strongly correlated with the quality of milk fat and relates to a high concentration of unsaturated fatty acids, as well as high content of conjugated dienes of linoleic acid (C18:2 c9, t11; CLA). Oleic acid (C18:1 c9; OA) is important representative of monounsaturated fatty acid (MUFA) found in adipose tissue and in triacylglycerols of cow’s milk fat. Dairy products are the major dietary source of CLA, but CLA is also found in the meat from ruminants. CLA is a term used to describe positional (carbon 6,8 to 12,14) and geometric (cis-cis (c), cis-trans (c,t), trans-cis (t, c) and trans-trans (t, t)) isomers of linoleic acid (C18:2 n6 c9, c12; LA). The content of major CLA isomers in ruminants milk fat could be precisely determining both by standards method e.g.: gas chromatography with a flame – ionization detector (GC-FID) and silver ion high performance liquid chromatography (Ag+HPLC) or by more advanced techniques e.g. gas chromatography – mass spectrometry (GC-MS) (Radzik-Rant et al. 2012). Stearoyl-CoA desaturase (SCD) 38 B. Kuczyńska et al. catalyzes the introduction of the first cis-double bond in the delta-9 position (between carbons 9 and 10) in several fatty acyl-CoA substrates. Activity of SCD enzyme is regulated by many different factors, e.g.: diet, hormones, temperature, metals, peroxisomal proliferators, vitamin A and developmental processes (Bernard et al. 2001 by Ntambi 1995, 1999). In cow’s milk, OA, palmitoleic acid (C16:1 c9) and substantial part of CLA are synthesised endogenously, in the mammary gland through the action of mammary delta-desaturase on stearic (C18:0), palmitic (C16:0) and vaccenic (C18:1 t11; TVA) acids (Griinari and Bauman 1999). Nutrition and herd management practices appears to be the factors which have the highest effect on the CLA concentration in milk and milk products, and an organic diet based on fresh or dried forage, that is rich in CLA precursory fatty acids, may improve the yield of fatty acids with beneficial effects on health (Prandini et al. 2009). Analysis of the fatty acid composition of milk fat (derived from different species of animals), showed that organic system significantly shapes the antioxidant capacity of milk (Barłowska et al. 2011, Kuczyńska 2011a, b, Markiewicz-Kęszycka et al. 2013). It should be noted that organic milk reduced eczema incidence in infants (Rist et al. 2007, Kummeling et al. 2008). Differences in the levels of SCD activity may be explained by the significant variations in the content of unsaturated fatty acids (MUFA, TVA, CLA, LA etc.) in cow’s milk fat in response to the dietary factors (Griinari and Bauman 1999, Chilliard et al. 2000). High importance is attributed to feeding regime at organic farms, as well as a higher biological value of pastures (a higher proportion of herbs, clovers or Fabaceae plants) compared to non-organic ones (Ellis et al. 2006, Collomb et al. 2008, Butler et al. 2011, Kuczyńska et al. 2011a, b, Baars et al. 2012). The concentration of essential fatty acids (EFAs) can be increased in cow’s milk through the diet manipulation by supplementation of cow’s diet various types of oils or seeds (Reklewska et al. 2002, Puppel et al. 2013). An increasing interest in enhancing CLA content in milk, particularly C18:2 cis9, trans11, has been linked to beneficial health effects of this isomer. CLA arises anti-carcinogenic, anti-diabetic, anti-atherogenic, anti-lipogenic and immunomodulatory functions observed in clinical and biological research (Pariza 1999, Parodi 1999). In addition CLA inhibit chemically induced tumors, prevent atherosclerosis and improve the protein-to-fat ratio in experimental animals. The aim of this study was to determine variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow’s milk during the grazing season. MATERIAL AND METHODS The study was carried out in 10 certified organic farms The major criterions of choosing organic farms to the experiment were as follows: obtaining certificate for at least five years, abidance of the organic farming standards, and possessing a herd of Black and White Polish Holstein-Friesian cows (numbering more than 30 cows). Selected farms were located in Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors... Mazovia region in close neighborhood, to provide comparable climate and soil conditions. Representative milk samples (from 165 cows) were collected from each cow during milking by means of a milk meter in the milking parlor during grazing seasons (from May to August). At the initial grazing period (May) cows were grazing on pasture (ad libitum) and additionally received 10 kg of grass silage and 2 kg of concentrate per cow daily. Then, from June to August basis diet of cows constituted a pasture. Cows were strip-grazed on a multispecies pasture (Dactylis glomerata L. 16%; Phalaris arundinacea L. 6%; Agrostis stolonifera L. 3.4%; Poa pratensis L. 14.5%; Lolium perenne L. 14%; Festuca rubra L. 4.3%; Trifolium repens 15.5%; Trifolium pratense L. 4.5%; Poa annua and P. trivialis 8.3%. Five quadrants (1 m2 each) of pasture (from each organic farms) were cut one day of each week pre- and post-grazing to determine chemical composition. Combined milk from morning and evening milking was placed in sterile bottles, preserved with Mlekostat CC (660 samples of milk; 165 samples of milk per month). After milking, samples were immediately submitted to the Cattle Breeding Division (Milk and Meat Testing Laboratory of Warsaw University of Life Sciences) for analysis. Analyzed of health-promoting compounds of cow’s milk lipid fraction included determination concentrations of CLA, TVA and LA. Extraction of crude fat was performed according to Röse-Gottlieb procedure (AOAC 1995), at a room temperature. Fatty acid methylation was performed according to the transesterification method by EN ISO 39 5509:2000. Analysis of fatty acid methyl esters (FAME) was carried out with a gas chromatograph (GC instrument type 7890A Agilent Technologies) with Agilent ChemStation, using a Varian CP-SIL 88 fused-silica capillary column (100 m length, 0.25 mm internal diameter and 0.20 μm film thickness). The separation of one micro liter of each sample was performed at pre-programmed temperature: column temperature was kept at 130°C, for 1 min, then increased from 130 to 175°C at rate of 5.5°C per min (kept at 175°C for 8 min), and then to 215°C at rate of 2.75°C per min, and was kept at 215°C for 10 min. Subsequently temperature increased from 215 to 230°C at rate of 20°C per min and was kept at 230°C for 10 min. Total run time was 52.477 min. Purified helium was used as a carrier gas, with a head pressure of 49.6 kPa and a constant column flow of 1.5 ml per min. The flow rate of the carrier gas was average velocity to 23.535 cm per sec. The injection system (Agilent Technologies type G 4513A) used a split ratio of 1 : 100 and an injector temperature 180°C. The detection by a flame-ionization detector (FID) detector was temperature at 250°C. Peaks of individual fatty acids were identified by using pure fatty acids standards: PUFA 1 from marine, composed of 18 fatty acid standards from C14:0 to C24:1 and with individual C18:1 trans11 and CLA standards (Sigma-Aldrich). Additionally, selected saturated and monounsaturated fatty acids were analyzed in order to formulate index of activity of stearoyl-CoA desaturase (SCD) enzyme as an indicators of endogenous precursors of unsaturated fatty acids in cow’s milk. Activity of SCD enzyme was assessed 40 B. Kuczyńska et al. and calculated as proposed by Smith et al. (2002), using the following formula: (C16:1 + C18:1) / (C14:0 + C16:0 + + C18:0 + C16:1 + C18:1). The data obtained were analyzed statistically using analysis of variance (least squares) by means of the SPSS 21 packet software. The model used for analyzed milk samples was Yijk = μ + Ai + eij where: Yijk – dependent variable; μ – general mean; Ai – month effect (May, June, July, August); eij – standard error. RESULTS AND DISCUSSION The nutritional requirements of the animals and the nutritive value of their diet were calculated in accordance with the nutrition standards set out in the INRATION 4.0 software. Table 1 summarizes the feeding characteristics during grazing period from May to August. In the current study, activity of stearoyl-CoA enzyme and endogenous precursors of unsaturated fatty acids of cow’s milk was weakening with the passage of the grazing season (Fig. 1). Generally, the highest concentrations of CLA cis9, trans11 isomer, TVA and LA in milk fat has been reported in June, slightly lower in July and August. While the lowest level has been recorded in May, at the beginning of grazing period. The first time in the 1930s already, Both et al., noted that summer milk had a greater absorbance at 233 nm than milk produced in the winter. In 1963, Riel noted that summer milk fat had more conjugated dienoic acid than winter milk fat. Ruminants that are exlusively pasture fed produce greater levels of TVA and CLA compared to those fed indoors (Nałęcz-Tarwacka 2006), although this effect is depended on the specific diet composition (Puppel et al. 2013). The CLA content mirrored the TVA rather than LA content with a drop TVA in TVA TABLE 1. Chemical composition and nutritional value of pastures used in cow feeds (% of DM) Traits Ash Crude protein Ether extract Crude fibre UFL PDIN PDIE NDF ADF LA LNA Pasture May 8.21 14.2 2.4 27.82 0.85 88.96 84.92 42.30 30.4 11.82 33.3 June 8.33 18.52 3.89 26.62 0.84 115.23 96.53 48.56 31.26 43.75 60.6 July 8.81 18.82 4.13 28.62 0.91 115.75 95.62 52.84 40.3 42.5 52.16 August 8.89 19.23 3.56 29.01 0.89 102.56 93.24 45.63 28.96 28.95 45.15 Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors... 41 4 3,5 ** 3 2,5 SCD 2 TVA LA 1,5 CLA 1 0,5 0 May June July August ** May different from June, July and August for TVA, LA and CLA by contrast (P ≤ 0.01). FIGURE 1. Variation in the activity of SCD enzyme and the concentrations of TVA, LA, and CLA (g per 100 g of fat) in cow’s milk during the grazing period beginning in June and occurring before the drop in CLA in August. This result is partially explained by the fact CLA in milk is mainly from delta-9 desaturasion of TVA in the mammary gland in ruminants. TVA of cow’s milk fat is primarily from rumen biohydrogenation in the pathway LA → CLA cis9, trans11 → TVA → C18:0 → C16:0. Soyeurt et al. (2008) reported positive genetic correlations between the indices of C14, C16 C18 (0.72, 0.62 and 0.97, respectively) and monounsaturated fatty acids (MUFA), and showed that proportion of MUFA is linked to the activity of SCD. In Table 2 significant correlations between activity of SCD enzyme and selected indexes of delta-9 desaturase, such as: C14:1 index, C16:1 index and C18:1 index, (0.144, 0.243 and 0.638, respectively) has been presented. Increasing the concentration of C18:0 and C18:1 acids and lower level of C16:0 acid are typical for cows which are grazed on pasture. In the case of cows fed TMR TABLE 2. Relationships between selected indexes of delta-9 desaturase and month of grazing, and correlations between activity of SCD enzyme and selected indexes of delta-9 desaturase Traits May June July August LSM SE LSM SE LSM C14:1index ABC 0.13 0.003 0.10 A 0.002 B 0.11 0.002 0.11 C16:1 index 0.06ABC 0.003 0.06A 0.002 0.05B 0.002 0.05C C18:1index 1.99 0.057 1.78 0.034 b 1.85 0.035 1.84 0.035 0.63** 0.402** 0.005 0.32 0.003 0.32 0.003 0.32 0.003 27.33ABC 0.608 29.63A 0.364 29.77B 0.363 29.8C 0.375 0.82** MUFA Abc 0.31 A C c SE Correlations SE SCD LSM SCD MUFA 0.002 0.14** 0.149** 0.002 0.24** Values in the rows marked with the same letters differ significantly A,B,C P ≤ 0.01; a,b,c P ≤ 0.05. **Significant correlaction has been reported. 1 –0.049 0.828** 1 42 B. Kuczyńska et al. diet an inverse relationship has been demonstrated (Kelly et al. 1998, Nałęcz-Tarwacka 2006, Kuczyńska 2011). CONCLUSION In the current study significant correlations between MUFA and SCD (r2 = 0.828, P < 0.01) has been recorded. We concluded, that monitoring of SCD activity can be used as a tool to achieve high unsaturation of milk fat, during grazing period. Acknowledgements Researches was supported by the National Science Center and realized within the project N N 311 320135 entitled “Bioactive components and technological parameters of milk produced at ecological and conventional farms”. Additionally, we would like to express our very great appreciation and respects to Professor Henryk Grodzki. We feel deeply honored to have worked with such remarkable Scientist and we are grateful for his exceptional help, endless patience and encouragement that accompanied us through all those years. 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SGGW, Warszawa. MARKIEWICZ-KĘSZYCKA M., CZYŻAK-RUNOWSKA G., LIPIŃSKA P., WÓJTOWSKI J., 2013: Fatty acid profile of milk – a review. Bull. Vet. Inst. Pulawy 57: 135–139. PRANDINI A., SIGOLO S., PIVA G., 2009: Conjugated linoleic acid (CLA) and fatty acid composition of milk. curd and Grana Padano cheese in conventional and organic farming systems. J. Dairy Res.76 (3): 278–282. PUPPEL K., KUCZYŃSKA B., NAŁĘCZ-TARWACKA T., GRODZKI H., 2013: Influence of linseed variety on fatty acid profile in cow’s milk. J. Sci. Food Agric. 93: 2276–2280. RADZIK-RANT A., ROZBICKA-WIECZOREK A., RANT W., CZAUDERNA M., KUCZYŃSKA B., 2012: The content of cis-9, trans-11 CLA isomer determined by two methods in ewe’s milk fat. Ann. Warsaw Univ. Life Sci. 51: 119–126. REKLEWSKA B., OPRZĄDEK A., REKLEWSKI Z., PANICKE L., KUCZYŃSKA B., OPRZĄDEK J., 2002: Alternative for modifying the fatty acid composition and decreasing the cholesterol level in the milk of cows. Liv. Prod. Sci. 76: 235–243. RIST L., MUELLER A., BARTHEL C., SNIJDERS B., JANSEN M., SIMÕES-WÜST A.P., HUBER M., KUMMELING I., VON MANDACH U., STEINHART H., THIJS C., 2007: Influence of organic diet on the amount of conjugated linoleic acids in breast milk of lactating women in the Netherlands. British J. Nutr. 97: 735–743. SOYEURT H., DEHARENG F., MAYERES P., BERTOZZI C., GENGLER N., 2008: Variation of Δ9-desaturase activity in dairy cattle. J. Dairy Sci. 91: 3211–3224. 43 TURPEINEN A.M., MUTANEN M., ARO A., SALMINEN I., BASU S., PALMQUIST D.L., GRIINARI J.M., 2002: Bioconversion of vaccenic acid to conjugated linoleic acid in humans. Am. J. Clin. Nutr. 76: 504–510. Streszczenie: Wpływ okresu wypasu pastwiskowego na poziom indeksu enzymu stearoilo-CoA desaturazy i jego endogennych prekursorów nienasyconych kwasów tłuszczowych w mleku krowim. Celem pracy było określenie zmienności w aktywności enzymu delta-9 desaturazy SCD i koncentracji endogennych prekursorów nienasyconych kwasów tłuszczowych w mleku krów w okresie wypasu pastwiskowego. Badania przeprowadzono w 10 certyfikowanych gospodarstwach ekologicznych. Główne kryteria wyboru gospodarstw ekologicznych do eksperymentu to: posiadanie certyfikatu od co najmniej pięciu lat i przestrzeganie standardów z ekologicznej produkcji, utrzymywanie minimum 30 krów rasy polskiej holsztyńsko-fryzyjskiej w stadach. Najwyższe koncentracje: izomeru CLA c9, t11, TVA i LA w tłuszczu mlekowym wykazano w czerwcu, nieco niższe w lipcu i sierpniu. Najniższe poziomy natomiast zaobserwowano w maju, w początkowym okresie wypasu pastwiskowego. Wykazano istotną korelację (p ≤ 0,01) między MUFA i SCD (r2 = 0,828). Podsumowując, monitorowanie aktywności SCD może być użyteczne jako narzędzie w celu zwiększania nienasycenia tłuszczu mleka pozyskiwanego w trakcie wypasu pastwiskowego. MS received May 2015 Authors’ address: Beata Kuczyńska Zakład Hodowli Bydła Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW ul. Ciszewskiego 8, 02-786 Warszawa, Poland e-mail: beata_kuczyń[email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 45–49 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Relationships between milk β-carotene concentrations and the cytological quality of cow’s milk BEATA KUCZYŃSKA, ALEKSANDRA KAPUSTA, KAMILA PUPPEL, TERESA NAŁĘCZ-TARWACKA, ARKADIUSZ BUDZIŃSKI, MARCIN GOŁĘBIEWSKI, MARTA CZUB, HENRYK GRODZKI Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Abstract: Relationships between milk β-carotene concentrations and the cytological quality of cow’s milk. The objective of the study was to describe the relationship between milk β-carotene concentration and the cytological quality of milk of high yielding cows. The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences – SGGW (WULS). From a herd of 320 Polish Holstein-Friesian cows maintained in a free-stall dairy shed 58 cows were selected taking into consideration the stage of lactation (15 ±14 days). Cows were fed a total mixed ration (TMR) diet provided ad libitum. Four groups of cows taking into consideration concentration of β-carotene in milk has been created: (1) below 150 mg/l; (2) 151–250 mg/l; (3) 251–450 mg/l; (4) beyond 450 mg/l. The content of β-carotene and SCC amounted at the herd level: 192 103 ml and 0.312 mg/l respectively. The β-carotene content ranged from 0.150 to 0.451 mg/l. The highest content of β-carotene, 0.451 mg/l, was found in milk of cows with the lowest level of somatic cells count (SCC). The lowest level, 0.150 mg/l, was found in milk of cows with the highest level of SCC. Milk SCC varies significantly with the concentration of β-carotene in cow’s milk. Researchers should consider monitoring for this variable as potential cofounder when exploring the relationship between mastitis, intramammary infection and nutritional management. Key words: β-carotene, somatic cells count, immunity INTRODUCTION Mastitis is the most common infectious disease of dairy cows and results in economic loss for both dairy farmers and for dairy’s (Geary et al. 2012). The production of high quality milk is a requirement to sustain a profitable dairy industry and somatic cell count (SCC) values are routinely used to identify subclinical mastitis (Philpot and Nickerson 2000). Age, number of quarters with intramammary infection, season, nutrition are significant factors that have been associated with SCC (Schepers et al. 1997, Kuczyńska 2011, Puppel et al. 2012). Increased SCC with parity may be attributed to increased prevalence of intramammary infection and greater cellular response to certain pathogens. β-carotene stabilizes the free radicals, as meaning breaking the sequence of radical reactions, and prevents radical degradation processes of cell components (Kankofer and Albera 2007). Carotenoids have diverse biological functions and actins, the most important of which are effective antioxidants in vitro, but the situation in vivo is less clear. It stabilizes the free radicals, as meaning breaking 46 B. Kuczyńska et al. the sequence of radical reactions, and prevents radical degradation processes of cell components. Preferably also operates on the reproductive system. It has been proved that the higher content of β-carotene reduces the incidence of retained placenta, and accelerates and supports ovarian luteal activity (Kankofer and Albera 2007, Kawashima et al. 2009, Kumar et al. 2010). Carotenoids have also been reported to have immunomodulatory effects, such as the reduction in UV-induced immunosuppresion and the increase in natural killer cell activity after dietary supplementation with β-carotene (Van den Berg et al. 2000). Low plasma concentrations of β-carotene is associated with increased incidence of udder infection. Carotenoids also increase the lymphocytes population and their activity, stimulate phagocytosis (Chew 1993, Michal et al. 1994). The carotenoid content in roughage largely depends on environmental conditions. Important is the method of harvest, weather conditions, as well as a method of preserving feed (Bergamo 2003, Krzyżewski 2012). It has been proved that the drying may result in loss of β-carotene of as much as 83%. Ensiling process results in less losses but they get deeper as time goes on storage silage in a silo or prism (Krzyżewski 2012). The objective of the study was to describe the relationship between milk β-carotene concentration and the cytological quality of milk of high yielding cows. MATERIAL AND METHODS The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences – SGGW (WULS). From a herd of 320 Polish Holstein-Friesian cows maintained in a free-stall dairy shed 58 cows were selected taking into consideration the stage of lactation (15 ±14 days). Cows were fed a total mixed ration (TMR) diet provided ad libitum, formulated using the INRA system (Table 1). TABLE 1. Ingredient composition of the TMR diet Ingredients TMR diet Feeding ration (kg) Maize silage Alfaalfa silage Maize corn silage Concentrate Straw Total Concentrate (kg) Hydropalm – by pass oil Fodder chalk NaHCO3 BetaLac – premix NaCl Rapeseed meal Soya meal Grain meal Rumex Ca3(PO4)2 Total 23.33 10.83 3.70 5.12 1.00 43.98 0.60 0.15 0.12 0.13 0.05 2.23 2.30 1.30 0.005 0.05 6.94 Sampling Representative milk samples were collected from each cow during milking by means of a milk meter in the milking parlor. Milk samples were taken individually from each cow 10 times during the experiment at monthly intervals. Milk analyses Analysis of the somatic cell count (SCC) was performed using a Somacount-150 Relationships between milk β-carotene concentrations and the cytological quality... counter (Bentley Poland, Warsaw, Poland). Analysis of β-carotene was established using an Agilent 1100 Series reverse phase high-performance liquid chromatograph (Agilent Technologies, Waldbronn, Germany) and Zorbax Eclipse XDB C8 column (4.6 × 150 mm, 5 μm film thickness) according to the method described by Puppel et al. (2012). Four groups of cows taking into consideration concentration of β-carotene in milk has been created: (1) below 150 mg/l; (2) 151–250 mg/l; (3) 251–450 mg/l; (4) beyond 450 mg/l. Statistical analyses The data obtained were analyzed statistically by multifactor analysis of variance using SPSS 21.0 (SPSS Inc., Chicago, IL, USA). Yijkl = μ + Ai + Bj + (Ai × Bj) + eijk where: Yijkl – dependent variable; μ – general mean; Ai – β-carotene effect (i = 1–4, where: (1) < 150 mg/l; (2) 151–250 mg/l; (3) 251–450 mg/l; (4) > 450 mg/l); Bj – SCC effect; Ai × Bj – interaction between β-carotene content and SCC; eiij – standard error. TABLE 2. β-carotene and somatic cells count of bovine milk during experiment Ingredient N LSM SEM Somatic cells count (103/ml) 580 192A 26.674 β-carotene (mg/l) 580 0.312A 0.0083 LSM – least square of the mean, SEM – standard error of the mean, values in the column marked with the same letters differ significantly at P ≤ 0.01. In contrast, Morris (2002) reported lower concentration of β-carotene (0.1 mg/l). Milk composition can be altered by the feeding regime. The content of β-carotene was shown to be transferred either directly from the feed to the milk (Kuczyńska 2011) or from supplements added to the cows’diet (Puppel et al. 2012). Puppel et al. (2012) reported, that modification of the diet of cows with fish oil and linseed significantly influenced antioxidant properties of their milk; however, the response of multiparous and primaparous cows was noticeably different to the supplement introduced. The content of β-carotene ranged at the herd level from 0.150 to 0.451 mg/l. The highest content of β-carotene, 0.451 mg/l, was found in milk of cows with the lowest level of SCC (Table 3). TABLE 3. Effect of β-carotene concentration in milk on the somatic cells count N Somatic cells count (103/ml) SEM 0.150 112 279 ABC 60.653 0.151–0.250 186 210 AD 47.066 0.251–0.450 164 160 BDE 50.124 > 0.451 118 125 CDE 59.091 β-carotene (mg/l) RESULTS AND DISCUSSION The content of β-carotene and somatic cells count (SCC) amounted at the herd level: 192 103/ml and 0.312 mg/l respectively (Table 2). The overall mean for β-carotene content were similar to the value obtained by Kuczyńska (2011). 47 SEM – standard error of the mean, values in the column marked with the same letters differ significantly at P ≤ 0.01. 48 B. Kuczyńska et al. The lowest level, 0.150 mg/l, was found in milk of cows with the highest level of SCC. LeBlanc (2004) reported, that concentration of β-carotene in milk from cows with mastitis is almost half lower (0.070 mg/l), than from cows with healthy gland (0.160 mg/l). Cows suffering from severe mastitis tend to produce milk containing less β-carotene and more retinol than non-infected cows (Chew et al. 1993). It has been proved, that the higher content of β-carotene reduces the incidence of retained placenta, and accelerates and supports ovarian luteal activity (Kankofer 2007, Kawashima et al. 2009, Kumar et al. 2010). It can therefore concluded that carotenoids also affect the immunity of the mammary gland, slow down the inflammatory process (mastitis), and thus contribute to a lower content of SCC in milk (Chew 1993, Michal 1994). CONCLUSION Milk SCC varies significantly with the concentration of β-carotene in cow’s milk. Researchers should consider monitoring for this variable as potential cofounder when exploring the relationship between mastitis, intramammary infection and nutritional management. Acknowledgement Researches was supported by National Science Center and realized within the project NN 311 55 8840 entitled “Relationship between concentration of bioactive substances in milk during standard lactation and blood biochemical parameters of high yielding Polish Holstein-Friesian cow’s”. REFERENCES BERGAMO P., 2003: Fat soluble vitamin contents and fatty acid composition in organic and conventional Italian dairy products. Food Chem. 82 (4): 625–631. CHEW B.P., 1993: Role of carotenoids in the immune response. J. Dairy Sci. 76: 2804–2811. GEARY U., LOPEZ-VILLALOBOS N., BEGLEY N., MCCOY F., O’BRIEN B., O’GRADY L., SHALLOO L., 2012: Estimating the effect of mastitis on the profitability of Irish dairy farms. J. Dairy Sci. 95: 3662–3673. KANKOFER M., ALBERA E., 2007: The concentration of vitamin a and its provitamin – β-carotene in bovine retained and not retained placenta. Acta Vet. (Beograd), 57 (2–3): 181– –189. KAWASHIMA C., NAGASHIMA S., SAWADA K., SCHWEIGERT F.J, MIYAMOTO A., Kida K., 2010: Effect of β-carotene supply during close-up dry period on the onset of first postpartum luteal activity in dairy Cows. Reprod. Dom. Anim. 45: 282–287. KRZYŻEWSKI J., STRZAŁKOWSKA N., BAGNICKA E., JÓŹWIK A., HORBAŃCZUK J., 2012: Wpływ antyoksydantów zawartych w tłuszczu pasz objętościowych na jakość mleka krów. Żywność – Nauka – Technologia – Jakość 3 (82): 35–45. KUCZYŃSKA B., 2011: Bioactive components and technological parameters of milk produced at ecological and conventional farms. Dissertations and Monographs. Wydawnictwo SGGW, Warsaw (In Polish, with an English abstract). KUMAR S., PANDEY A.K., MUTHA M.R., RAZZAQUE W.A.A., 2010: Role of β-carotene / vitamin A in animal reproduction. Vet. World 3 (5): 236–237. LeBLANC S.J., HERDT T.H., SEYMOUR W.M., DUFFIELD T.F., LESLIE K.E., 2004: Peripartum serum vitamin E, retinol, and beta-carotene in dairy cattle and their associations with disease. J. Dairy Sci. 87: 609–619. MICHAL J.J., HEIRMAN L.R., WONG T.S., CHEW B.P., 1994: Modulatory, effects of dietary on blood and mammary leukocyte function in periparturient dairy cows. J. Dairy Sci. 77: 1408–1421. MORRIS C.A., KNIGHT T.W., NEWMANS S.A.N., HICKEY S.M., DEATH A.F., O’NEILL Relationships between milk β-carotene concentrations and the cytological quality... 49 K.T., RIDLAND M., 2002: Genetic studies of carotenoids concentration in the plasma and milk of New Zeland dairy cattle. New Zeland J. Agri. Res. 45: 27–33. PHILPOT W.N., NICKERSON S.C., 2000: Winning the fight against mastitis. Westfalia-Surge, Inc.: 13–15. PUPPEL K., NAŁĘCZ-TARWACKA T., KUCZYŃSKA B., GOŁĘBIEWSKI M., KORDYASZ M., GRODZKI H., 2012: The age of cows as a factor shaping the antioxidant level during a nutritional experiment with fish oil and linseed supplementation for increasing the antioxidant value of milk. J. Sci. Food Agric. 92: 2494–2499. SCHEPERS A.J., LAM T.J., SCHUKKEN Y.H., WILMINK J.B., HANEKAMP W.J., 1997: Estimation of variance components for somatic cell counts to determine thresholds for uninfected quarters. J. Dairy Sci. 80: 1833–1840. Van den BERG H., FAULKS R., FERNANDO GRANADO H., HIRSCHBERG J., OLMEDILLA B., SANDMANN G., SOUTHON S., STAHL W., 2000: The potential for the improvement of carotenoid levels in foods and the likely systemic effects. J. Sci. Food Agric. 80: 880–912. (15 ±14 dni), jak również i wiek krów (wieloródki). Krowy objęte były całorocznym żywieniem TMR, ad libitum. Po uzyskaniu wstępnych wyników, krowy zostały podzielone na cztery grupy, biorąc pod uwagę średnią koncentrację β-karotenu w tłuszczu mlekowym: (1) poniżej 150 mg/l; (2) 151–250 mg/l; (3) 251–450 mg/l; (4) powyżej 450 mg/l. Prezentowane wyniki stanowią średnią z 10 pobrań uzyskanych od krów w trakcie trwania laktacji 305-dniowej. Średnia zawartość β-karotenu i LKS w mleku krów dla całego stada wyniosła odpowiednio 0.312 mg/l i 192 tys./ml. Biorąc pod uwagę zawartość LKS w mleku, koncentracja β-karotenu znajdowała się w przedziale od 0.150 do 0.451 mg/l. Największą zawartość β-karotenu, 0.451 mg/l, wykazano w mleku krów o najwyższej jakości cytologicznej. Najniższy poziom natomiast w mleku o najwyższym poziomie LKS – 279 103/ml. Badania wykazały, że poziom LKS w istotny sposób kształtowany jest przez stężenie β-karotenu w mleku krów. Dlatego też, powinno się rozważyć monitorowanie tej zmiennej jako potencjalnego czynnika w trakcie określania zależności między zakażeniem wymienia, mastitis i bilansowaniem dawek pokarmowych w bioaktywne składniki dla wysokowydajnych krów. Streszczenie: Zależność między zawartością β-karotenu a jakością cytologiczną mleka. Celem pracy było określenie zależności między koncentracją β-karotenu a jakością cytologiczną mleka wysokowydajnych krów rasy PHF. Doświadczenie przeprowadzono w Rolniczym Zakładzie Doświadczalnym SGGW Obory – Wilanów. Ze stada podstawowego liczącego 320 krów rasy polskiej holsztyńsko-fryzyjskiej, utrzymywanych w systemie wolnostanowiskowym, wyselekcjonowano 58 krów, biorąc pod uwagę stadium laktacji MS received May 2015 Authors’ address: Beata Kuczyńska Zakład Hodowli Bydła Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW ul. Ciszewskiego 8, 02-786 Warszawa Poland e-mail: beata_kuczyń[email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 51–57 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Relationships between production traits and the parity of Polish Holstein-Friesian cows BEATA KUCZYŃSKA, ARKADIUSZ BUDZIŃSKI, ALEKSANDRA KAPUSTA, KAMILA PUPPEL, TERESA NAŁĘCZ-TARWACKA, MARCIN GOŁĘBIEWSKI, AGATA WÓJCIK, HENRYK GRODZKI Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Abstract: Relationships between production traits and the parity of Polish Holstein-Friesian cows. The objectives of the study was to describe the relationships between milk urea, protein, fat concentrations and the age of Polish Holstein-Friesian cows. The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences – SGGW (WULS). From a herd of 320 Polish Holstein-Friesian cows maintained in a free-stall dairy shed 50 cows were selected. Parity had significant effect on the shaping the concentration of the production traits. The highest content of protein, 3.87%, was found in milk of cows during 3rd and subsequent lactations in the 10th collecting (above 271 day of lactation). The fat content ranged at the herd level from 3.18 to 4.89 %, the highest level has been recorded in milk of cows during 3rd and subsequent lactations, in the 10th collecting (above 271 day of lactation). The urea content ranged at the herd level from 183 to 267 mg/l. Milk production traits varies significantly with the age of cows. Hence, researchers should consider monitoring for this variable as potential cofounder when exploring the relationship between urea, protein, fat content in milk and nutritional management for meeting the production requirements of cows. Key words: cow, parity, protein, fat, urea INTRODUCTION The gross composition of cow’s milk is variable, because many factors influence the end product. These variations can be related to genetics and environment parameters. The milk composition also varies within the cows from milking to milking and with the intensification of production, stage of lactation, disease and age of the cows (Nałęcz-Tarwacka 2006, Januś 2008, Kuczyńska 2011, Puppel et al. 2012). Concentration of urea in milk is also variable from herd to herd and within cows. The variation in milk urea concentrations indicates a wide variation in protein, energy and water intake (Minakowski 2006). The proper formulation of cows diet requires to appropriately balance diets for rumen digestion and absorption of needed nutrients for maintenance of body tissue and production of milk. Hof et al. (1997) reported that regular measurement of milk urea N in bulk samples can be used to monitor N losses from rumen fermentation. The cow production depends not only on its genetic and physiological characteristics but also on the quantity and quality of nutrients to its intermediary metabolism. Production traits are the result of the voluntary intake and the nutrient density of feed intake (Piłat 52 B. Kuczyńska et al. 2006). The INRA system distinguishes TABLE 1. Ingredient and chemical composition the various parts of proteins which are of the TMR diet finally digested in the intestine, i.e. PDIA Composition TMR diet (Protein Digestible in the Intestine from Ingredient (kg/day) dietary origin), microbial protein allowed Maize silage 25.000 by available fermentable N (PDIMN) Alfaalfa silage 9.400 and microbial protein allowed by avail- Corn silage 3.700 able fermentable energy (PDIME). The Concentrate 5.200 sum of PDIA + PDIMN, and the sum Straw 1.000 of PDIA + PDIME gives PDIN and Concentrate (kg) PDIE values of a feed (Kowalski et al. Hydropalm – by pass oil 0.600 2008). Balancing a cows basal diet with Pasture ground chalk 0.150 the appropriate supplementary feeds is NaHCO3 0.125 achieved when PDIN and PDIE values BetaLac – premix 0.130 are equal (+/–50 g) and meet the producNaCl 0.050 tion requirements (Kida 2003). 2.230 The objectives of this study was to Rapeseed meal Soya meal 2.300 describe the relationships between milk 1.300 urea, protein, fat concentrations and the Grain meal Rumex 0.005 parity of Polish Holstein-Friesian cows Ca3(PO4)2 0.050 during lactation. Chemical composition MATERIAL AND METHODS The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences – SGGW (WULS). From a herd of 320 Polish Holstein-Friesian cows maintained in a free-stall dairy shed 50 cows were selected taking into consideration: stage of lactation (8 ±14 days) and parity (1st, 2nd, 3rd and subsequent lactations). During the experimental period cows feeding ration was based on the total mixed ration (TMR) diet provided ad libitum, formulated using the INRA system. Representative TMR samples were analyzed for dry matter, crude protein, ash, ether extract, acid detergent fiber, neutral detergent fiber. Chemical composition of the treatment diets is presented in the Table 1. DM (%) Crude protein (% of DM) Acid detergent fiber (% of DM) Neutral detergent fiber (% of DM) Ash (% of DM) Ether extract (% of DM) Ca (% of DM) P (% of DM) Total (ULF) Total (PDIE) (g) Total (PDIN) (g) 57.500 18.500 19.000 28.500 5.000 4.500 0.700 0.500 19.500 1860 1835 Sampling Representative milk samples were collected from each cow during milking by means of a milk meter in the milking parlor. Milk samples were taken individually from each cow 10 times during the experiment at monthly intervals (10 collecting from each cow). The samples Relationships between production traits and the parity of Polish Holstein-Friesian cows 53 were collected at following stages of lactation: first: 8–30; second: 31–60; third: 61–90; fourth: 91–120; fifth: 121–150; sixth: 151–180; seventh: 181–210; eighth: 211–240; ninth: 241–270 and tenth: above 271 day of lactation. Ai – parity effect (1, 2, 3 ,4); Bj – stage of lactation effect; (Ai × Bj) – interaction between parity and stage of lactation; eij – standard error. Milk analysis RESULTS AND DISCUSSION Gross milk composition, i.e. fat, protein, and urea content, were determined by automated infrared analysis (FTIR) with a Milkoscan FT-120 instrument (FOSS Electric, Hillerød, Denmark). Parity had significant effect on the shaping the concentration of the protein in cow’s milk. The content of this constituents ranged during lactation at the herd level from 2.95 to 3.87%. The highest content of protein, 3.87%, was found in milk of cows during 3rd lactation in the 10th collecting (above 271st day of lactation, Fig. 1). The overall mean for protein (Table 2) content were similar to the value obtained by Gnyp et al. (2006). Chalupa (1984), reported, that supplemental protein can increase milk yield by providing more amino acids, by increasing available energy, and by altering efficiency of utilization of absorbed nutrients. Statistical analyses The data obtained were analyzed statistically using analysis of variance (least squares) by means of the SPSS 21 packet software. The model used for analyzed milk samples was Yijk = μ + Ai + Bj + (Ai × Bj) + eij where: Yijk – dependent variable; μ – general mean; 4.1 3.9 Protein [%] 3.7 3.5 1st lactaon 3.3 2nd lactaon 3.1 3rd lactaon 2.9 2.7 2.5 1 2 3 4 5 6 7 8 9 10 FIGURE 1. Relationships between concentration of protein and the parity of Polish Holstein-Friesian cows 54 B. Kuczyńska et al. TABLE 2. Relationships between production traits and the parity of Polish Holstein-Friesian cows Parameter Parity 1st lactation 2nd lactation 3rd and subsequent lactations average for the entire herd 1st lactation 2nd lactation 3rd and subsequent lactations average for the entire herd 1st lactation 2nd lactation 3rd and subsequent lactations average for the entire herd 1st lactation 2nd lactation 3rd and subsequent lactations average for the entire herd Protein (%) Fat (%) Fat: protein ratio (-) Urea (mg/l) LSM 3.39ab 3.44b 3.47a 3.44 3.88Ab 4.12bc 4.42Ac 4.14 1.14Ab 1.20bc 1.27Ac 1.20 183ABC 267A 264B 243 SEM 0.194 0.276 0.293 0.251 0.497 0.368 0.653 0.550 0.115 0.103 0.182 0.170 8.584 6.611 11.562 11.341 LSM – last square mean; SEM – standard error of the mean; values in the column marked with the same letters differ significantly A,B,C at P ≤ 0.01, a,b,c at P ≤ 0.05. The fat content ranged at the herd level from 3.18 to 4.89%. The highest content of fat, 4.89%, was found in milk of cows during 3rd and subsequent lactations; in the 10th collecting – above 271st day of lactation (Fig. 2). The overall mean for fat (Table 2) were similar to the value obtained by Grodzki and Brzozowski (2005) and Nogalski (2006). The higher fat content in the multiparous cow’s milk could be due to more intense fat reserve mobilization 5.5 Fat [%] 5 4.5 1st lactaon 2nd lactaon 4 3rd lactaon 3.5 3 1 2 3 4 5 6 7 8 9 10 FIGURE 2. Relationships between concentration of fat and the parity of Polish Holstein-Friesian cows Relationships between production traits and the parity of Polish Holstein-Friesian cows in early lactation (Berry et al. 2007). In contrast Borkowska (2005) showed that the age of cows affect only milk yield. While, Litwińczuk et al. (2006) reported, that parity is associated with decrease in fat content. The fat: protein ratio ranged at the herd level from 1.14 to 1.27. The highest ratio, 1.27 was found in milk of cows during 3rd and subsequent lactations (Table 2). The optimum fat: protein ratio is 1.2–1.4. Lower values are likely to lead to subclinical rumen acidosis which can interfere with reproductive performance of cows. The fat: protein ratio higher than 1.4 signals energy deficit and subclinical ketosis (Pogorzelska et al. 2004). Toni et al. (2011), reported that analyses of milk components in early postpartum (6–9 days in milk), particularly the ratio of fat: protein is a valuable indicator of lipomobilization and the negative energy balance status in post partum cows. The urea content ranged at the herd level from 183 to 267 mg/l. The highest content of urea, 267 mg/l, was found in milk of cows during 2nd lactation (Table 2). It significantly differed from LSM in cows during 1st lactation. Godden et al. (2001) reported significant differences between lactations, also with the lowest concentrations of urea in cows in the 1st lactation. The overall mean for urea were similar to the value obtained by Sawa et al. (2010) and Slósarz (2011), who reported a mean for urea of 260 mg/l (optimal range of 250 to 270 mg/l). However, lower values were reported by other researchers. In contrast OstenSacken (1999) found, that the lower concentration of urea in cow’s milk is associated with a lack of metabolic burden, associated with a history of lactations, 55 and therefore the level below to 200 mg/l is satisfactory for primiparous cows. Milk urea concentration can be used as a tool to monitor protein feeding efficiency and dietary protein-energy ratio in dairy cows (Hof et al. 1997). CONCLUSION Milk production traits varies significantly with the age of cows. Hence, researchers should consider monitoring for this variable as potential cofounder when exploring the relationship between urea, protein, fat content in milk and nutritional management for meet the production requirements of cows. Acknowledgement Researches was supported by National Science Center and realized within the project NN 311 55 8840 entitled “Relationship between concentration of bioactive substances in milk during standard lactation and blood biochemical parameters of high yielding Polish Holstein-Friesian cow’s”. REFERENCES BERRY D.P., BUCKLEY F., DIPLOM P., 2007: Body condition score and live weight effects on milk production in Irish Holstein-Friesian dairy cows. Anim. 1 (9): 1351–1359. BORKOWSKA D., 2005: Użytkowanie mleczne. In: Hodowla i użytkowanie bydła. Praca zbiorowa pod red. Litwińczuka i Szulca. Państwowe Wyd. Rolnicze i Leśne, Warszawa: 97–106. CHALUPA W., 1984: Discussion of protein symposium. J. Dairy Sci. 67: 1134–1146. GNYP J., KOWALSKI P., TIETZE M., 2006: Wydajność mleka krów, jego skład i jakość cytologiczna w zależności od niektórych czynników środowiskowych. Ann. Universe. Maria Curie-Skłodowska 24 (3): 17–26. 56 B. Kuczyńska et al. GODDEN S.M., LISSEMORE K.D., KELTON D.F., LESLIE K.E., WALTON J.S., LUMSDEN J.H. 2001: Relationships between milk urea concentrations and nutritional management, production, and economic variables in Ontario dairy herds. J. Dairy Sci. 84: 1128–1139. GRODZKI H., BRZOZOWSKI P., 2005: Hodowla i użytkowanie bydła. (In:) Hodowla i użytkowanie zwierząt gospodarskich. Ed. H. Grodzki. Wydawnictwo SGGW, Warszawa: 11–17, 23, 37–42. HOF G., VERVOORN M.D., LENAERS P.J., TAMMING S., 1997: Milk urea nitrogen as a tool to monitor the protein nutrition of dairy cows. J. Dairy Sci. 80: 3333–3340. JANUŚ E., 2008: Podstawowe wskaźniki płodności krów i ich związek z wydajnością. Hodowca Bydła 11: 28–37. KIDA K., 2003: Relationships of metabolic profiles to milk production and feeding in dairy cows. J. Vet. Med. Sci. 65 (6): 671–677. KOWALSKI Z.M., STRZETELSKI J.A., NIWIŃSKA B. NOWAK W., PAJĄK J., SZYSZKOWSKA A., 2008: Standardowe metody oznaczania rozkładu białka pasz w przewodzie pokarmowym zwierząt przeżuwających. Wiad. Zoot. 44 (4): 53–58. KUCZYŃSKA B., 2011: Bioactive components and technological parameters of milk produced at ecological and conventional farms. Treaties and Monographs. Warsaw University of Life Sciences – SGGW, Warsaw. LITWIŃCZUK A., BARŁOWSKA J., KRÓL J., SAWICKA W., 2006: Porównanie składu chemicznego i zawartości mocznika w mleku u krów czarno-białych i simentalskich z okresu żywienia letniego i zimowego. Ann. Universe. Maria Curie-Skłodowska 24 (10): 67–72. MINAKOWSKI D., 2006: Żywienie krów w aspekcie wymagań produkcji mleka wysokiej jakości. Hodowca Bydła 3: 8–11. NAŁĘCZ-TARWACKA T., 2006: Effect of selected factors on the functional component content of milk fat in dairy cows. Treaties and Monographs, Treaties and Monographs. Warsaw University of Life Sciences – SGGW, Warsaw. NOGALSKI Z., 2006: Zależność między płodnością i mlecznością a niektórymi cechami budowy krów. Rocz. Nauk. Polskiego Tow. Zoot. 2 (4): 57–66. OSTEN-SACKEN A., 1999: Oznaczanie poziomu mocznika w mleku – nowy parametr informacyjny dla hodowcy. Przeg. Hodowla. 6: 5–8. PIŁAT J., 2006: Potrzeby pokarmowe bydła. (In:) Żywienie bydła. Wydawnictwo Uczelniane Akademii Techniczno-Rolniczej, Bydgoszcz: 54–69. POGORZELSKA J., JASTRZEBSKI M., SZAREK J., 2004: Wpływ wybranych czynników na kształtowanie sie stosunku białko–tłuszcz w mleku krów pierwiastek o wysokim udziale genów rasy HF. Zesz. Nauk. Przegl. Hodowla. 72 (1): 217–225. PUPPEL K., NAŁĘCZ-TARWACKA T., KUCZYŃSKA B., GOŁĘBIEWSKI M., KORDYASZ M., GRODZKI H., 2012: The age of cows as a factor shaping the antioxidant level during a nutritional experiment with fish oil and linseed supplementation for increasing the antioxidant value of milk. J. Sci. Food Agric. 92: 2494–2499. SAWA A., BOGUCKI M., JANKOWSKA M., KRĘŻEK-CZOPEK S., 2010: Wpływ wybranych czynników na udział prób mleka o określonej zawartości białka i mocznika. Acta Scient. Polon. 9 (3): 57–64. SLÓSARZ J., 2011: Analiza żywienia. (In:) Metody chowu i hodowli bydła. Wydawnictwo SGGW, Warszawa: 327–329. TONI F., VINCENTI L., GRIGOLETTO L., RICCI A., SCHUKKEN Y.H., 2011: Early lactation ratio of fat and protein percentage in milk is associated with health, milk production, and survival. J. Dairy Sci. 94 (4): 1772–1783. Streszczenie: Kolejność laktacji krów rasy PHF jako czynnik kształtujący poziom cech użytkowych mleka w intensywnym systemie produkcji. Celem badania było oszacowanie zależności między zawartościami białka, tłuszczu, oraz mocznika w zależności w od kolejności laktacji. Badaniami objęto 50 krów rasy polskiej holsztyńsko-fryzyjskiej. Za pomocą spektrofotometrii w podczerwieni FTIR oznaczono koncentrację poszczególnych składników mleka. W pracy wykazano zróżnicowane poziomy składników użytkowych mleka w kolejnych laktacjach. Największą zawartość białka, 3,87%, stwierdzono w mleku krów w okresie 3. laktacji, w 10. pobraniu (powyżej 271. dnia laktacji). Zawartość tłuszczu wahała Relationships between production traits and the parity of Polish Holstein-Friesian cows się na poziomie od 3,18 do 4,89%, najwyższy poziom wykazano w mleku krów będących w 3. laktacji, w 10. pobraniu (powyżej 271. dnia laktacji). Zawartość mocznika wahała się przedziale od 183 do 267 mg/l na poziomie stada. Cechy produkcyjne mleka różniły się znacznie w zależności od wieku krów. Sugeruje się, aby w trakcie zarządzania stadami wielkotowarowymi uwzględniać obserwację zmiennej, jaką jest wiek krów (numer laktacji), przy bilansowaniu dawek pokarmowych w poszczególnych grupach produkcyjnych. MS received May 2015 Authors’ address: Beata Kuczyńska Zakład Hodowli Bydła Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW ul. Ciszewskiego 8, 02-786 Warszawa Poland e-mail: beata_kuczyń[email protected] 57 Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 59–70 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Changes in the concentration of selected minerals in milk and blood of high-milking cows during lactation TERESA NAŁĘCZ-TARWACKA1, MARCIN GOŁĘBIEWSKI1, BEATA KUCZYŃSKA1, KAMILA PUPPEL1, AGATA WÓJCIK1, MAŁGORZATA BRZEZIŃSKA1, MARTA CZUB1, MICHAŁ BENET2 1 2 Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Dairy Cooperative “Spomlek” Abstract: Changes in the concentration of selected minerals in milk and blood of high-milking cows during lactation. The aim of this research was the analysis of the content of calcium, phosphorus and magnesium in milk and blood of Polish Holstein-Friesian (PHF) milking cows during full lactation. The research was conducted on 100 PHF cows during two years (50 cows in each year). Samples of milk and blood were taken in each month of lactation (10 samples) in order to determine minerals concentration. Additionally, samples of forage were pooled out. Study revealed that the level of calcium in the feed is too low, the level of phosphorus – optimal, whereas the content of magnesium exceeds animal demand. There were significant differences in the content of calcium, phosphorus and magnesium in the consecutive months of cows’ lactation. The content of minerals in blood was normal; similar situation was observed in the case of the calcium and phosphorus in milk, with the exception of milk magnesium concentration, which was too low and most diversified during the lactation. Key words: minerals, blood, milk INTRODUCTION The concentration of minerals in the blood can diagnose many diseases, such as pasture tetany, kidney disease or postnatal paralysis (Kowalski 2012). In turn, their content in milk is important in processing, it is also a direct indicator of the quality of the raw material and milk products, and indirect indicator of environmental pollution (Brodziak 2011). Minerals affect the physical properties of the milk and the stability of the proteins. Increasing concentration of magnesium ions reduces the thermal stability of milk protein (Jaworski and Kuncewicz 2008). The amount of calcium determines the suitability of milk for cheese production and the magnesium participates in the construction and activation of enzymes (Król et al. 2006, Kuczyńska 2011). According to Soszka (2012), there are numerous papers on the mineral nutrition of dairy cows. Few, however, is a work depicting the interrelationships between minerals. Most balanced minerals are calcium and phosphorus, less magnesium. Appropriate calcium to phosphorus ratio is very important in the prevention of metabolic diseases, which often occurs in dairy herds. Mineral content in milk is variable and depends on many factors (genetic and environmental) (Dymnicka 1998). According to Jaworski and Kuncewicz (2008), skimmed milk has a mineral content as follows (in mg per 60 T. Nałęcz-Tarwacka et al. 100 cm3): Ca – 100–140, P – 75–110 and Mg – 75–110. The aim of this research was to analyze the mineral content in the milk and blood of high-yielding cows during full lactation and to determine the relationship between them. MATERIAL AND METHODS The experiment was conducted at the Agricultural Experimental Farm at Wilanów-Obory. Cows were kept in free-stall system and were fed Total Mixed Ration (TMR) adapted to milk performance. TMR included: corn silage, hay silage, alfalfa hay silage, corn silage, straw and ration appropriate for the technology group. The organoleptic evaluation confirmed good feed quality. Feeds have a pleasant smell, the right color, hay and silage well preserved. The composition of the rations is presented in Table 1. TABLE 1. Daily ration for experimental cows (kg) Feeds Corn silage Grass silage Alfalfa haylage Corn grain silage Concentrate Straw TMR-1 28 – 8.5 5.8 7.76 – TMR-2 23 – 10 4.4 5.1 0.7 TMR-3 20 – 15 1 2.2 1 TMR-1 was prepared for cows with daily milk yield of 39 kg, TMR-2 for cows with a capacity of 28 kg, while TRM-3 for cows with a yield of 18 kg of milk. Total mixed rations were supplemented with tray elements and vitamins according to cows requirements. The research was conducted on 100 PHF cows during two years (50 cows in each year). Samples of milk and blood were taken (at the same day) in each month of lactation (10 samples) in order to determine minerals concentration. Additionally, samples of forage were pooled out. Milk samples were collected in accordance with the requirements of PN-EN ISO 707:208 from the evening milking (250 ml) into sterile plastic containers containing Mlekostat CC preservative. The samples were transported to the Laboratory Milk Evaluation at the Department of Animal Breeding. Blood was collected from the tail vein. The sample containing 1 ml of blood and the preservative was transported to the Laboratory of the Veterinary Medicine Faculty. Blood minerals (calcium, phosphorus and magnesium) were determined by biochemistry analyzer BT-200 (Cormay). The milk samples minerals were determined test strips by REFLEKTOQUANT Merck. Statistical analysis were performed using IBM SPSS 21.0 statistical package. To estimate the impact of the analyzed factors on minerals blood and milk concentration two-way analysis of variance was used (GLM procedure) by following model: Yijk = μ + Ri + Pj + (R × P)ij + eijk where: Yijk – variable; μ – average general; Ri – influence of year, i = 1, 2; Pj – the effect of the j lactation month, j = 1 , 2, 3, ..., 10; (R × P)ij – the effect of the lactation month and year interaction; eijk – random error. Changes in the concentration of selected minerals in milk and blood of high-milking cows... To determine the relationship between the minerals in the blood and milk, and between minerals and other constituents of milk Pearson correlation was calculated. 61 around 74.64–86.13%. This indicates inadequate cover of the animals needs. The coverage ratio for phosphorus was lowest in cows with the lowest productivity. Cows fed TMR-1, producing 40 kg of milk per day, had covered 114% of their requirements. Analyzing the values shown in Table 5 it can be seen that the animals magnesium supply was above the norm and ranges between 128 and 132%. RESULTS AND DISCUSSION Table 2 presents a comparison of the demand and minerals intake of cows depending on their daily performance. It contains information on the coverage of the daily requirement of the animals. Comparing calcium intake and animals requirements, it was observed, that the requirement coverage fluctuates Mineral content in the blood Figure 1 presents the amount of calcium in the blood of cows during the 10 consecutive months of lactation. The results TABLE 2. Minerals requirement and consumption Milk performance (kg) Ca 111 138 163 Mg 23.5 29.5 37 Ca 95.6 103 136 Consumption (g) P 55 77.6 101 concentraƟon (mg·dl–1) 17.5 27.5 40 Requirement (g) P 60.5 75.5 88.5 lactaƟon months FIGURE 1. The blood calcium content of the cows Mg 31.1 38.2 47.4 Coverage of requirement (%) Ca P Mg 86.13 90.91 132.17 74.64 102.78 129.42 83.44 114.12 128.05 62 T. Nałęcz-Tarwacka et al. pancreas dysfunction. However, clinical hypocalcemia, due to a decrease in blood Ca levels below 5 mg·dl–1, is the main cause of post partum retention – a frequent problem of many breeders. The obtained results indicate that the animals were not at risk due to the Ca content in the blood. Figure 2 presents the content of phosphorus in the blood of cows during 10 consecutive months of lactation. The results obtained in the first and second year of experience fluctuated between 5.309 and 7.005 mg·dl–1. There were a statistically significant differences in the content of P in the blood between successive months of the first (P ≤ 0.01) and second (P ≤ 0.05) year of the study. Statistically significant differences in the contents of the P in the blood between the years stated in the following months of lactation: fourth, seventh and tenth (P ≤ 0.01), as well as the fifth and eighth (P ≤ 0.05). Winnicka (2011) stated that values are correct for cattle at a level of 5.6–6.5 mg·dl–1. concentraƟon (mg·dl–1) in both the first and second year of the experiment were in the range of 7.777 to 10.783 mg·dl–1. A statistically significant difference in the blood Ca content between lactation months (P ≤ 0.01) and the years, was observed. The reference values given by Winnicka (2011) range from 9.00 to 12.10 mg·dl–1. In both the first and second year of experience in the seventh month of lactation, the lowest content of Ca was found in the blood, 9.547 mg·dl–1 in the first year and 7.777 mg·dl–1 in the second year, respectively. However, in the eighth month of lactation blood contained the highest content of Ca. In the first year of the experiment observed value 10.783 mg·dl–1, and the second 10.684 mg·dl–1, respectively. Study reviled that the Ca content in the blood of cows was normal, except for the its concentration in the seventh month (7.777 mg·dl–1) in the second year of the study. According to Winnicka (2011), analysis of the Ca content in the blood helps diagnose kidney malfunction, parathyroid and lactaƟon months FIGURE 2. The content of phosphorus in the blood of cows Changes in the concentration of selected minerals in milk and blood of high-milking cows... tion. The results obtained within two years of research range from 1.769 to 2.555 mg·dl–1. There was a statistically significant differences in the content of magnesium in the blood between following months of lactation: first, second, fourth, fifth, eighth, ninth and tenth (P ≤ 0.01) and sixth (p ≤ 0.05) and the years. The reference values given by Winnicka (2011) ranged from 1.90 to 3.00 mg·dl–1. The lowest concentration of the Mg was observed in the first year of the study reported in the eighth month of lactation (1.769 mg·dl–1), while in the second year of the study the lowest value was reported in the seventh month of lactation (2.023 mg·dl–1). The highest concentration of Mg in the first year of the experiment was 2.538 mg·dl–1 and was recorded in the third month of lactation, and in eight months (2.555 mg·dl–1) in the second year of the study. The results reviled that the Mg content in the blood of analyzed cows was physiologically normal. Symptoms of tetany may occur concentraƟon (mg·dl–1) The lowest phosphorous content in the first year of the study was found in the first month of lactation, it was 5.309 mg·dl–1, while in the second year – the lowest value of 5.575 mg·dl–1 was observed in the ninth month. Study revealed that the highest content of P was observed in fourth month of the first year of the study and the seventh month the second year (7.005 and 6.556 mg·dl–1, respectively). Researches confirmed that P content in the blood was physiologically normal, with the exception of the level of 5.309 mg·dl–1 observed in the first year of the study. Winnicka (2011) reported the content of phosphorus in the blood can be helpful in the diagnosis of hyperparathyroidism and thyroid dysfunction. Jamroz (2001) indicates that P level it is not accurate source of information, since the element concentration in the blood is dependent on the concentration of Mn, Mg and Cu in the feed. Figure 3 presents the concentration of magnesium in the blood of cows during 10 consecutive months of lacta- 63 lactaƟon months FIGURE 3. The content of magnesium in the blood of the cows 64 T. Nałęcz-Tarwacka et al. when magnesium concentrations fall below 1.7 mg·dl–1. To conclude that the studied mineral content in the blood of the test animals were ranged within normal limits (with just a few exeptions). Low feed coverage for Ca was not reflected in its concentration in the blood. Mineral content in the milk of cows concentraƟon (mg·dl–1) Figure 4 presents the calcium content in milk of cows during 10 consecutive month of lactation. The results of milk Ca concentration obtained in the experiment of both the first and second year of the experiment are in the range of 598 to 1096.6 mg·l–1. There were a statistically significant differences in Ca concentration in the milk between successive months (P ≤ 0.01) and between successive years. According to Gabryszczuk et al. (2010), the calcium content in milk varies from 600 to 1200 mg·l–1. Research conducted by Kuczyńska (2011) indicated that contents of the Ca in milk was aver- aging 1020 mg·l–1. According to the researchers conducted by Krzyżewski et al. (2009), the content of calcium in 100 g of milk was 119 mg. Similar results were presented by Kuczyńska et al. (2009). Lower Ca concentration of PHF breed cows reported Brodziak et al. (2011) averaging 919.0 mg·dm–3. Black and White breed variety cows milk was characterized by the lowest Ca content (108.6 mg%), and the highest was reported in the Simmental (138.2 mg%), according to Litwińczuk (2004). According to the research of Mountain (2002), the calcium content of milk in winter and was higher than in the summer (1.12 vs 1.05 g·kg–1, respectively). Milk from different regions of the Poland characterized by the difference in calcium and magnesium, which is reported in the Górska (2002) study. In the first year of the experiment the lowest content of the element in the milk was recorded in the seventh month of lactation and it was 614.5 mg·l–1, while the highest in the eighth –989.7 mg·l–1. lactaƟon months FIGURE 4. The content of calcium in milk of trial cows Changes in the concentration of selected minerals in milk and blood of high-milking cows... exception of the first month. Kuczyńska (2011), reported that reference value of phosphorus in milk ranges between 750 and 1100 mg·l–1, and the results of her study reviled that P content in milk originated from intensive and organic farms fluctuated at 807 and 824 mg·l–1 respectively. According to the research Krzyżewski et al. (2009), the phosphorus content in milk was 93 mg·100 g–1. Research of Litwińczuk (2004) confirmed that milk of Black and White breed variety cows contained the lowest phosphorus concentration (80.8 mg%), and Simmentals’ milk was the richest in P (108.3 mg%). The lowest content of the P in the first year of the experiment was 348.8 mg·l–1 and was recorded in the eighth month of lactation. In the second year of the experiment the lowest content was 542.1 mg·l–1, and was observed in tenth month concentraƟon (mg·dl–1) In the second year of the experiment the lowest calcium content in milk was characterized by milk from the fourth month of lactation and was 598.0 mg·l–1, while the highest in the second month of lactation – 1096.6 mg·l–1. Drop in the content of Ca in milk in the seventh lactation month was probably the result of its lowest concentration in the blood of experimental animals. Figure 5 shows the phosphorus content in the milk of cows during lactation. The results in both the first and second year of the study are in the range of from 348.8 to 1024.6 mg·l–1. There was a statistically significant differences in the content of P in the milk between successive months (P ≤ 0.01) and between studied years. Statistically significant differences in the content of the P in the milk between the years stated in each month of lactation (P ≤ 0.01) with the 65 lactaƟon months FIGURE 5. Phosphorus content in the milk of trial cows T. Nałęcz-Tarwacka et al. concentraƟon (mg·dl–1) 66 lactaƟon months FIGURE 6. Magnesium content in the milk of trial cows of lactation. In both the first and second year of study in the first month of lactation the maximum P content in milk was observed (863.3 and 1024.6 mg·l–1 in the first and year respectively). Study reviled that phosphorus content was decreasing with consecutive lactation months. Figure 6 presents the magnesium content in the milk of cows during 10 consecutive months of lactation. The results in both the first and second year of the experiment were in the range of 45.69 to 111.33 mg·l–1. There was a statistically significant differences in Ca concentration in the blood between successive months (P ≤ 0.01) and studied years. Statistically significant differences in the content of the Mg in the milk was stated between first, second, third, fourth, seventh and eighth month, however, however, the biggest differences were observed between the fifth and ninth month. The reference values given by Kuczyńska (2011) range from 120 to 134 mg∙l–1. In a study conducted by Kuczyńska (2011) the magnesium content in milk from conventional farms averaged 112 mg·l–1 and organic at 107 mg·l–1. Studies of Brodziak et al. (2011) reviled that the Mg content in milk averaged 127.9 mg·dm–3, while Krzyżewski (2009) reported the average Mg content of 13 mg per 100 g of milk. Mountain research (2002) confirmed higher magnesium content in milk harvested in winter (91.38 mg·kg–1) than in summer (85.13 mg·kg–1). In the experiment, the maximum magnesium content of the milk was observed in eight months and ninth month of lactation, 111.33 mg·l–1 in the first and 107.07 mg·l–1 in the first and second year of lactation, respectively. The lowest values milk magnesium content were reported in 67 raƟo Changes in the concentration of selected minerals in milk and blood of high-milking cows... lactaƟon months FIGURE 7. The calcium to phosphorus ratio in milk cows during 10 consecutive months of lactation the third and fourth month of lactation (61.71 and 45.69 mg·l–1, for the first and second year respectively). Our study reviled that the magnesium content in the milk of cows are normal in the early and late lactation, and from the second to the seventh month of lactation were obtained lower values than in the studies Górska (2002) and Kuczyńska (2011). Figure 7 presents the calcium to phosphorus ratio in milk consecutive months. The results in both the first and second year of the experiment ranged between 0.974 to 2.896. A statistically significant difference in ratio of calcium to phosphorus in milk between successive months (P ≤ 0.01) and years were reported. Significant differences in the Ca : P in milk were stated in the third, fourth, fifth, sixth, seventh, eighth and ninth month. In the experiment, the high values of Ca : P was reported in the eighth and second month of lactation, in the first and second year respectively (2.896 (at first) and 1.488 (in the second year of the experiment).The lowest ratio of Ca and P in the first year of experience characterized by the milk from the first month of lactation (1.191), while in the second year of milk from the fourth month of a characterized by the lowest Ca : P – 0.974. According to Kłobukowski and Kozikowski (2008), the most advantageous relation between Ca and P should be established at 1.2 : 1. Kuczyńska (2011) studies reported that Ca : P in milk ranged between 1.2 and 1.3. The study results obtained in the second experiment are similar to those reported in the literature. Table 3 presents the correlation coefficients between the minerals contained in milk and its concentration in the blood. Analysis of these values, reviled that there is a negative, highly significant relationship between the content of magnesium in the blood and the content of calcium in milk (–0.116) and the Ca to P ratio. Also negative correlation between the content of phosphorus in the blood and phosphorus in milk was reported. However, the relationship between the content of phosphorus in the blood and 68 T. Nałęcz-Tarwacka et al. TABLE 3. Correlation between the mineral components in the milk and blood Chemical element Ca milk Mg milk P milk r Mg blood P blood Mg milk P milk Ca : P milk Ca blood Mg blood P blood 1 0.334** 0.068* 0.515** 0.006 –0.116** 0.071 0.000 0.045 0.000 0.884 0.003 0.074 866 866 866 642 642 642 1 significance P ≤ n 866 r 0.334 significance P ≤ 0.000 n 866 ** 0.016 0.174 –0.019 –0.077 0.023 0.639 0.000 0.639 0.051 0.559 642 642 642 –0.066 0.078 0.096 0.049 ** 866 866 866 r * 0.068 0.016 1 –0.725 significance P ≤ 0.045 0.639 ** 0.000 * –0.079* 0.045 n 866 866 866 866 642 642 642 r 0.515** 0.174** –0.725** 1 0.067 –0.150** 0.142** 0.000 0.000 0.000 0.091 0.000 0.000 Ca : P significance P ≤ milk n Ca blood Ca milk 866 866 866 866 642 642 642 r 0.006 –0.019 –0.066 0.067 1 0.154** 0.229** significance P ≤ 0.884 0.639 0.096 0.091 0.000 0.000 n 642 642 642 642 642 642 642 r –0.116** –0.077 0.078* –0.150** 0.154** 1 0.114** significance P ≤ 0.003 0.051 0.049 0.000 0.000 n 642 642 642 642 642 0.004 642 642 r 0.071 0.023 –0.079 0.142 0.229 0.114 significance P ≤ 0.074 0.559 0.045 0.000 0.000 0.004 n 642 642 642 642 642 642 * ** ** ** 1 642 r – Pearson’s correlation coefficient; n – number; * correlation significant at the 0.05 level; ** correlation significant at the 0.01 level. the Ca to P ratio is positive and highly significant. CONCLUSIONS Study brought to following conclusions: – calcium in the blood and milk during lactation was physiologically normal, except for the seventh month of the second year of the study (blood) and the fourth month of the second year of the study (milk); – phosphorus level in the blood in full lactation period was physiologically normal except for the first and the seventh month of the first year of the study and the ninth of the second year of the study, while the content of the milk showed a declining trend during lactation; – magnesium concentration in the blood during a full lactation was physiologically normal with the exception of the eighth month of the first year of the Changes in the concentration of selected minerals in milk and blood of high-milking cows... study, while the milk was lower than the reference values (except the first and the tenth month of lactation); – there were significant correlation between blood and milk minerals. In summary, the properly fed an managed high-milk yielding cows at various stages of the lactation may suffer from slight calcium, phosphorus and magnesium deficiency what is reflected in blood and milk tests. Acknowledgements The research was carried out under a the National Science Centre’s grant entitled “The content of biologically active components in milk during lactation full in conjunction with high blood biochemical parameters cows PHF” (NCN grant N N311 558840), who was conducted by the Warsaw University of Life Sciences – SGGW, Cattle Breeding Division. REFERENCES BRODZIAK A., LITWIŃCZUK A., KĘDZIERSKA-MATYSEK M., KRÓL J., 2011: Zawartość wybranych makro- i mikroelementów w mleku krów różnych ras i serwatce podpuszczkowej. Ochr. Środ. i Zas. Natur. 48: 467–474. DYMNICKA M., 1998: Wpływ żywienia krów oraz wielkości produkcji mleka, stadium laktacji i kolejnych laktacji na zawartość wybranych wskaźników biochemicznych we krwi. Fundacja „Rozwój SGGW”, Warszawa: 8–11, 25–32. GABRYSZCZUK M., SŁONIEWSKI K, METERA E., SAKOWSKI T., 2010: Content of mineral elements in milk and hair of cows from organic farm. J. Elem. 15 (2): 259–267. GÓRSKA A., 2002: Jakość mleka towarowego w regionie południowego Podlasie z uwzględnieniem wpływu niektórych czynników wa- 69 runkujących. Rozprawa Naukowa nr 67, Akademia Podlaska Siedlce: 48–54. JAMROZ D., 2001: Składniki mineralne. In: Żywienie zwierząt i paszoznawstwo. Fizjologiczne i biochemiczne podstawy żywienia zwierząt. D. Jamroz (Ed.). Wydawnictwo Naukowe PWN, Warszawa: 61–91. JAWORSKI J., KUNCEWICZ A., 2008: Składniki mineralne mleka. (In:) Mleczarstwo. S. Ziajka (Ed.). Wydawnictwo Uniwersytetu Warmińsko-Mazurskiego Olsztyn: 82–84. KŁOBUKOWSKI J., KOZIKOWSKI W., 2008: Składniki mineralne. (In:) Mleczarstwo. S. Ziajka (Ed.). Wydawnictwo Uniwersytetu Warmińsko-Mazurskiego Olsztyn: 118–122. KOWALSKI Z.M., 2012: Uwaga na subkliniczną hipokalcemię u krów mlecznych w okresie okołoporodowym. Wet. w Terenie 3: 55–57. KRÓL J., LITWIŃCZUK Z., BARŁOWSKA J., KĘDZIERSKA-MATYSEK M., 2006: A content of macro- i microelements in milk of Black-White and Simentals cows troughout the summer and winter feeding seasons. Pol. J. Environ. Stud. 15 (2A): 395–397. KRZYŻEWSKI J., STRZAŁKOWSKA N., JÓŹWIK A., BAGNICKA E., HORBAŃCZUK J.O., 2009: Nutritive value and functional properties of goat milk. (In:) Proceedings of the international conference on Improvement of quality of animal products obtained in sustainable production systems with special reference to bioactive components and their benefit for human health. Jastrzębiec: 41–47. KUCZYŃSKA B., 2011: Składniki bioaktywne i parametry technologiczne mleka produkowanego w gospodarstwach ekologicznych i konwencjonalnych. Wydawnictwo SGGW, Warszawa: 25–26, 56–57. KUCZYŃSKA B., PUPPEL K., NAŁĘCZ-TARWACKA T., NIŻNIKOWSKI R., ŁOJEK J., BEYGA K., 2009: Wartość odżywcza mleka i siary pochodzących od różnych gatunków zwierząt. Przeg. Hod. 11: 12–17. LITWIŃCZUK Z., 2004: Skład chemiczny mleka. (In:) Surowce zwierzęce. Ocena i wykorzystanie. Z. Litwińczuk (Ed.). PWRiL, Warszawa: 72–73. SOSZKA M., 2012: Mieszanki witaminowo-mineralne w żywieniu bydła. Bydło 9: 18–23. 70 T. Nałęcz-Tarwacka et al. WINNICKA A., 2011: Wartości referencyjne podstawowych badań laboratoryjnych w weterynarii. Wydawnictwo SGGW, Warszawa: 52–53, 55–56, 64–65, 66–67, 71–72. Streszczenie: Zmiany zawartości wybranych składników mineralnych w mleku i krwi wysokomlecznych krów w okresie pełnej laktacji. Celem badań była analiza zawartości wapnia, fosforu oraz magnezu w mleku i we krwi wysokomlecznych krów w okresie pełnej laktacji. Badania przeprowadzono na 100 krowach rasy PHF w okresie dwóch lat (50 krów w każdym roku). Próbki mleka i krwi pobierano w każdym miesiącu laktacji (10 pobrań) i określano w nich zawartość składników mineralnych. Dodatkowo pobrano próby pasz. Wykazano, że poziom wapnia w dawkach jest zbyt niski, poziom fosforu optymalny, a zawartość magnezu w dawkach przekraczała zapotrzebowanie zwierząt. Stwierdzono statystycznie istotne różnice w zawartości Ca, P i Mg w poszczególnych miesiącach laktacji krów. Zawartość składników mineralnych we krwi była w normie, podobną sytuację zaobserwowano w przypadku zawartości wapnia oraz fosforu w mleku. Wyjątek stanowi stężenie magnezu w mleku, które jest zbyt niskie i najbardziej zróżnicowane w okresie laktacji. MS received May 2015 Authors’ address: Teresa Nałęcz-Tarwacka Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW ul. Ciszewskiego 8, 02-786 Warszawa Poland e-mail: teresa_nalecz_tarwacka @sggw.pl Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 71–82 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Analysis of results assessment of growth of Charolais beef cattle in Poland TOMASZ PRZYSUCHA, MARCIN GOŁĘBIEWSKI, HENRYK GRODZKI, KAROLINA WNĘK, JAN SLÓSARZ, MAŁGORZATA KUNOWSKA-SLÓSARZ, PIOTR TOKARSKI Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Abstract: Analysis of results assessment of growth of Charolais beef cattle in Poland. The aim of the study was to assess the utility of selected results of the French Charolais breed with respect to their compliance with the goal of racial breeding and standards adopted by the Polish Association of Breeders and Producers of Beef Cattle (PABPBC). The subject of the analysis were recording results of the French Charolais beef cattle breed in Poland. The study was based on data for the years 2002–2013 of PABPBC and the National Center of Animal Breeding (NCAB) for 1996– 2001. The data set included: n – the number of animals tested, min. – minimum values in the studied traits, max. – maximum value of the selected features, average – average values of the analyzed traits, SD – standard deviation. Evaluated properties are: average weight of cows (kg), the average body weight of calves after birth (kg), the average daily gains for age 210 days (g), the average body weight of calves at the age of 210 days (kg), the average milk yield (kg), the terms of cows and heifers calving aptitude, the distribution of the population according to the order of calving cows. One can observe a gradual decline in the share of Charolais breed in national beef cattle population, also shows a significant decrease in the number of crossbreds with Charolais breed. The average weight of cows in 2005–2006 amounting to 559.4 and 570.2 kg meet the standards for breeding of cows entered in the initial part of the herd book, which define the minimum weight of Charolais cows after first calving as 550 kg. The average weight at birth of heifer calves in each year assessment was similar, but after 2008 began more than 40 kg. In purebred bull calves was seen a systematic increase in the average birth weight. The difference in birth weights between heifers and bulls ranged from 1 kg in 1999 to 3.6 kg in 2012. High average daily weight gains of bulls to 210 days of age, at short extra supplementary fattening period of about one month allow to export the animals weighing about 300 kg at a good price. The average daily gains of heifers (550–560 g), guarantee obtaining at 15 months of age body weight allowing the commencement of breeding. From 30.4 to 47.8% Charolais cows in recent years delivered in the relevant period. Key words: beef cattle, Charolais, beef cattle recording INTRODUCTION Twenty years the Programme of Beef Cattle Breeding Development in Poland finished in 2014 (Jasiorowski et al. 1996). Due to the sparse pure-bred female population is difficult to talk about own national breeding program. Therefore, the maintenance of high standards of breed is the main task of PABPBC. Its implementation is, inter alia, beef recording conducted in cattle herds. The aim of beef recording is, in addition to collecting data on the relevant parameters of herd repro- 72 T. Przysucha et al. duction, potential growth and fattening traits and maternal characteristics, on the basis of which herds are improving by use of information processed in the current breeding advisory service to farmers, in order to improve the economic performance of stocks and the implementation of a breeding program in the herd breed and use this information in analytical studies on beef cattle breeding and research work and publications. The weight of a cow by its relationship with a caliber, has a direct impact on the course of calving (more cows tend to have a larger area of the pelvis channel) and body weight of calf, which, along with nutrition, has a significant impact on daily gains of calves during rearing. The weight of the calf at birth has an influence not only on the course of calving, but also on the subsequent results of its rearing. Daily gains of calves to 210 days of age determine their body weight at weaning, this in turn has an impact on the profit from the sale of reared calves (mainly bulls), or the cost of winter feeding of heifers for breeding, which must receive the required, minimum weight at the moment their mating at the age of 15 months. Calving season has a direct impact on the cost of maintaining the basic herd (maximum utilization of the entire grazing season) and the quality of breeding calves (health, growth rate). Distribution of cows calving aptitude in order of calving tells us about the longevity of cows, which particularly in the herds of beef cattle is one of the main factors affecting the reduction of costs of the herd. The aim of the study was to assess the utility of selected results of the French Charolais breed with respect to their compliance with the goal of breeding standards adopted by PABPBC. Height at sacrum for females was 135 cm, and 145 cm for males at maturity and body weight for females 850 kg, 1300 kg for males. An important selection factor is to maintain a high level of milk production and the exclusion of breeding males with a tendency to transmit high weight of calves at birth. Charolais breed in terms of breeding is an excellent paternal line to be crossed and this aspect on a par with good results in pure bred breeding will be given special attention in the course of selection work. In the national beef cattle breeding program there are set out, inter alia, the following standards for breeding of cows entered in the Table 1. TABLE 1. The following standards for breeding of cows (PZHiPBM, 2001–2014) Breed LIM CHA SAL HEF AAG SIM PMT WBL BDQ Min. body weight gain from birth 850 950 870 800 800 900 830 780 950 to 210 day of age (g) Min. body weight after 1st calving 480 550 500 460 460 530 470 450 550 (kg) Delivery easy, taking place by the nature forces, without human assistance Calves vitality alive, without body building defects Evaluation of type and construction min. 70 points The degree of massiveness and good good sufficient good musculature Colour in accordance with the breed standard Analysis of results assessment of growth of Charolais beef cattle in Poland MATERIAL AND METHODS The subject of the analysis were beef cattle evaluation results for the French Charolais breed in Poland. With respect to their compliance with the goal of racial breeding and standards adopted by the Polish Association of Breeders and Producers of Beef Cattle (PABPBC). The subject of the analysis were recording results of the French Charolaise beef cattle breed in Poland. The study was based on data for the years 2002–2013 of PABPBC and the National Center of Animal Breeding (NCAB) for 1996–2001. The data set included: N – the number of animals tested, min. and minimum values in the studied traits, max. and maximum value of the selected features, average – average values of the analyzed traits, SD – standard deviation. Evaluated properties are: average weight of cows (kg), the average body weight of calves after birth (kg), the average daily gains for age 210 days (g), the average body weight of calves at the age of 210 days (kg), the average milk yield (kg), the terms of cows and heifers calving aptitude, the distribution of the population according to the order of calving cows. The calculation of standardized animal body weight for given day in its life was done according to the following formula: MCS = [(MCB – MCU) / WW] × × WS + MCU where: MCS – standardized animal body weight (kg); MCB – mean body weight of the animal on the actual weighing (kg); MCU – actual body weight set for 48 hours at birth (kg); 73 WW – mean age of the animal on the weighing (days); WS – standardized age of the animal (s). There were calculated the average daily weight gain of the animal from the day of birth to 210 days of age, according to the formula: PDMC = (MCC – MCP) × × 1000 / (WK – WP) where: PDMC – mean increase in daily body weight (g); MCC – final body weight of the animal on the weighing day (kg); MCP – initial body weight of the animal on the weighing (kg); WK – mean age of the animal on the final weighing (days); WP – mean age of the animal on the initial weighing (days milk yield in dairy cows – is expressed in kg of milk per convention. The conversion 210 day lactation and is calculated according to the formula: WMM210 = (McOds × 1700) / calf age where: WMM210 – value of mother milk – milk yield for 210 day lactation conversion assuming calf birth weight 35 kg, per 1 kg body weight gain, which drank 10 kg milk a day during the first 3 months, and the remaining months of 8–9 kg a day; McOds – the actual weight of the calf at weaning (kg); calf age – actual age of the calf at the time of weaning from the mother (days). 74 T. Przysucha et al. RESULTS AND DISCUSSION Table 2 presents the quantitative changes of the female purebred population of Charolaise cattle in the years 1996–2013. It should be noted that in 2000–2006 the data included both cows and heifers, and since 2007, the data relate only to cows and excluding heifers. One can observe a gradual decrease in the breed discussed in the national cattle population, also shows a significant decrease in the number of crossbreds with Charolais breed. Table 3 shows the mean body weight of pure bred Charolais cows in the period in which this trait was evaluated. The average body weight of cows were much smaller than the predefined by PABPBC, according to which the weight of adult cow of discussed breed should be about 850 kg. Average weight of cows in 2005 amounting to 559.4 and 570.2 kg meet the standards for breeding of cows entered in the initial part of the herd book, which define the minimum weight of Charolais cows after first calving as 550 kg. It should be noted that the average weight of the cow did not change significantly over 8 years of evaluation of this trait, but rather high standard deviations indicate the wide variety of cows of the breed body weight. Genotype and weight of the mother cows are always described among the many factors involved in normal growth and development of calves. Numerous studies have TABLE 2. Quantitative changes of the female population of Charolais cattle in Poland* Beef breed female population Year 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 pure bred cross bred 3 939 6 063 7 227 8 375 9 085 9 129 9 735 11 768 13 884 17 130 19 597 14 541 17 481 15 435 16 436 16 216 16 724 17 481 4 952 5 772 7 601 8 243 9 468 9 748 8 968 9 382 10 925 11 710 13 100 11 676 12 097 7 711 7 576 7 459 7 070 6 633 total Charolais breed (purebred) Charolais breed (crossbred) 8 891 11 835 14 828 16 618 18 553 18 877 18 703 21 150 24 809 28 840 32 697 26 217 29 578 23 146 24 012 23 675 23 794 24 114 908 1 162 1 427 1 417 1 749 1 821 2 119 2 201 2 890 2 793 3 400 2 512 2 956 2 417 2 538 2 335 2 265 2 253 655 565 1 082 1 118 939 770 885 1 007 1 002 1 057 1 098 983 998 490 340 302 261 248 *From 2007 the list includes only the cows. Charolais breed (purebred + + crossbred) 1 563 1 727 2 509 2 535 2 688 2 591 3 004 3 208 3 892 3 850 4 498 3 495 3 954 2 907 2 878 2 637 2 526 2 501 Charolais breed share in the population 17.6 14.6 16.9 15.3 14.5 13.7 16.1 15.2 15.7 13.3 13.8 13.3 13.4 12.6 12.0 11.1 10.6 10.3 Analysis of results assessment of growth of Charolais beef cattle in Poland 75 TABLE 3. Body weight of purebred Charolais cows Year N 1999 2000 2001 2002 2003 2004 2005* 2006* 560 846 951 944 1017 1190 302 534 min. 340 400 470 450 480 460 500 400 Cow body weight (kg) max. average 1090 648.3 1050 640.8 1050 656.8 890 634.7 910 626.0 940 630.0 680 559.4 770 570.2 SD 108.4 94.3 90.0 81.5 78.8 82.4 45.3 36.2 *Body weight after first calving. shown that the weight of the cow has a significant impact on calf birth weight and daily gains during the rearing (Przysucha et al. 2002abcd, Przysucha et al. 2003). Therefore, the weight of a cow in adulthood is an important trait to be considered for breeding programs (Andersen 1978, Brown et al. 1989). Breeding goals for most beef breeds are focused on massive cow with a high caliber. Tables 4 and 5 how the average natal weight of calves. The average weight at birth of heifers in each year assessment was similar, but after 2008 began more than 40 kg. In purebred bulls a systematic increase in the average birth weight was noticed. The difference in birth weights between heifers and bulls ranged from 1 kg in 1999 to 3.6 kg in 2012. The birth weight of calves has a significant effect TABLE 4. Average body weight of purebred heifers at birth Year N 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Average 36 448 497 426 489 582 731 795 832 960 1063 1143 926 1014 896 600 min. 20 17 20 18 25 21 24 20 20 20 20 20 14 16 25 20.6 Body weight (kg) max. average 65 39.3 63 38.6 70 39.2 60 37.8 60 38.3 55 37.8 59 37.8 71 39.0 61 39.5 64 40.9 59 40.3 64 40.5 63 41.2 68 41.1 70 42.1 62.4 38.4 SD 6.2 6.1 6.7 5.8 4.8 4.8 4.5 8.0 4.6 6.2 5.3 4.9 5.4 3.0 5.6 5.7 76 T. Przysucha et al. TABLE 5. Average body of weight purebred bulls at birth Year N 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 400 408 435 436 494 590 769 753 826 933 980 1023 953 1004 916 min. 15 19 17 18 27 21 25 27 23 23 26 20 23 25 27 on weaning weight of calves and usually the calf is heavier at birth the greater the weight at the time of weaning (Przysucha et al. 2002abc). Tables 6 and 7 present data on the average daily gains of heifers and bulls from Body weight (kg) max. average 50 40.3 64 41.1 70 41.1 59 39.5 62 39.9 58 39.1 65 39.7 68 40.7 68 41.7 66 43.1 69 42.4 70 42.6 68 43.4 73 44.7 70 44.9 SD 4.4 6.7 7.8 5.7 5.0 5.1 4.9 5.2 5.0 6.2 5.6 5.8 6.0 6.4 6.2 birth up to 210 days of age. Average daily gains of heifers evaluated ranged from 897 to 1141 g in various years of assessment. While the average daily gains of bulls evaluated (1100 g) exceeded eight times during the 14 years of the assessment. TABLE 6. Average daily gains of purebred heifers to 210 days of age Year N 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 190 290 166 152 429 426 384 636 900 1040 1038 891 992 897 min. 509 509 527 614 629 561 457 629 1036 700 145 664 421 387 Daily gains (g) max. average 1478 896.6 1496 1039.9 1580 1057.2 1571 1059.4 1446 1036.3 1576 1056.5 1465 1049.8 1531 1039.9 1204 1140.9 1793 1019.5 1585 1030.8 1712 1055.1 1861 1114.0 1882 1057.0 SD 187.9 205.4 188.3 140.5 135.3 130.4 116.9 147.1 37.1 182.9 144.0 105.0 141.6 105.6 Analysis of results assessment of growth of Charolais beef cattle in Poland 77 TABLE 7. Average daily gains of purebred bulls to 210 days of age Year N 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 157 226 136 147 426 404 385 557 860 988 922 819 955 789 min. 504 505 520 528 540 510 714 759 494 523 309 400 607 427 Analyzing the data presented, it should be noted the large difference between the minimum and maximum daily gains in both heifers and bulls. High average daily weight gains of bulls to 210 days of age. at short extra supplementary fattening period of about one month allow to export the animals weighing about 300 kg at an good price. Dobicki (1995) study showed that the average daily gains of heifers (550–560 g), guarantee obtaining at 15 months of age body weight allowing the commencement of breeding. Table 8 includes the mean body weight of Charolais breed heifers at the age of 210 days in the different years of assessment. The average weight of heifers was evaluated 278 kg in 2012 and only 227 kg in 2000. Table 9 presents the data on body weight of Charolais bulls at the age of 210 days. The average weight of bulls evaluated in this age was 241.1 kg in 1999 and 291.9 kg in 2012 (a difference of more than 50 kg). Daily gains (g) max. average 1597 1054.7 1492 1093.4 1666 1088.3 1485 1120.4 1679 1109.9 1690 1159.5 1520 1145.0 1612 1125.7 1693 1073.1 2010 1118.3 1746 1081.6 1861 1129.3 1879 1146.3 1548 1115.3 SD 199.4 194.7 210.9 140.6 169.0 149.6 126.5 142.8 183.9 180.3 161.1 121.9 49.8 88.1 Table 10 includes the average milk yield of purebred cows in different years of assessment. As can be seen from the following statement, the average milk yield of cows of the breed was about 2100 kg and has not undergone significant changes in subsequent years. Since 2010 PABPBC stopped evaluation of this trait because the data presented should be approached with great caution because milk yield was calculated based on the weight gain of calves and as we know in the herd calves can always be found that approach to other cows and choke or are additionally fed by the breeder. Table 11 contains a summary of the terms of cows and heifers calving aptitude of analyzed breed in the following months of the year in 2000–2007. Seasonality in breeding beef herds calving aptitude is very important. because it allows more appropriate term of calving to receive in the future a very good quality breeding material with the least amount of cost of rearing (maximum 78 T. Przysucha et al. TABLE 8. Average body weight of purebred heifers at 210 days of age Year N 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 206 190 285 175 152 429 426 384 636 900 1040 1038 891 992 887 min. 120 150 152 140 165 168 151 116 178 140 120 173 178 125 120 Body weight (kg) max. average 394 231.1 346 227.0 349 257.4 376 259.6 372 262.6 348 255.1 375 260.1 351 259.4 380 256.7 393 245.5 400 256.3 412 260.4 389 265.1 396 278.0 410 259.6 SD 47.0 38.8 41.8 43.6 31.2 29.8 28.1 30.6 33.7 43.1 43.5 34.1 32.0 24.6 23.4 TABLE 9. Average body weight of purebred bulls at 210 days of age Year N 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 206 156 222 139 148 426 404 385 557 860 988 922 819 940 901 min. 120 174 152 141 150 144 160 180 185 55 155 110 120 145 130 utilization of pastures). Many authors believe (Dobicki 1996, Jasiorowski 1999, Jasiorowski and Przysucha 2004), that the period of mating and the resulting of calving aptitude time should not be longer than 2–3 months. Beef cows, Body weight (kg) max. average 394 241.1 375 263.6 347 269.5 396 270.0 362 277.8 396 272.1 400 283.6 357 269.0 440 275.3 425 267.3 450 275.1 452 271.7 440 282.9 450 291.9 420 280.2 SD 37.0 42.8 40.4 46.7 31.5 37.2 32.0 28.6 36.0 45.1 44.3 39.6 31.1 20.8 37.0 maintained all year round in grazing system should make the best offspring in the winter. Calves born in the period after the completion of the first period of milk drinking are prepared to make full use of the pasture, then their growth rate is fast. Analysis of results assessment of growth of Charolais beef cattle in Poland 79 TABLE 10. The average milk yield of purebred cows Year N 2000 2001 2002 2003 2004 2005 2006 2009 542 517 289 300 261 804 769 2062 min. 785 1055 1094 1214 1220 1004 1234 322 Estimated milk yield of cows (kg)* max. average 4365 2040.7 3422 2196.2 3206 2137.8 3011 2186.3 2744 1906.3 2510 2170.0 2980 2133.7 3829 2170.4 SD 361.1 420.3 368.9 260.7 282.9 229.9 212.5 319.7 *Milk yield estimated based on calf weight gain from birth to weaning. TABLE 11. Time of purebred cows and heifers calvings Year Unit 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 N % N % N % N % N % N % N % N % N % N % N % N % N % N % N % I 95 12.3 83 9 91 9 67 7 71 7 92 8 121 8 134 9 132 6 143 6.9 147 7.0 191 8.6 133 6.6 158 7.9 216 11 II 70 9.1 92 10.1 80 8.1 69 7.2 74 7.3 103 8.6 177 11.9 234 15.1 126 7.8 167 9.0 214 10.2 192 8.6 170 8.5 178 8.9 177 9.5 III 144 18.7 193 21.2 158 16.1 176 18.4 128 12.6 204 17.1 187 12.6 323 20.9 272 13 276 13.2 254 12.0 268 12.0 237 11.8 262 13.2 259 13.2 IV 121 15.7 160 17.6 143 14.5 150 15.7 162 15.9 200 16.8 218 14.6 321 20.7 296 14.2 277 13.3 333 15.8 299 13.4 291 14.5 256 12.9 242 12.4 V 91 11.8 81 8.9 122 12.4 108 11.3 124 12.2 115 9.6 145 9.7 123 7.9 218 10.5 214 10.3 221 10.5 270 12.1 202 10.1 238 11.9 174 8.9 Months VI VII 63 43 8.2 5.6 65 48 7.2 5.3 71 56 7.2 5.7 92 56 9.6 5.8 102 81 10 8 132 76 11.1 6.4 167 86 11.2 5.8 67 45 4.3 2.9 221 170 10.6 8.2 200 133 9.6 6.4 171 161 8.1 7.6 231 168 10.4 7.5 254 129 12.7 6.4 158 143 7.9 7.2 147 162 7.5 8.3 VIII 18 2.3 24 2.6 48 4.9 56 5.8 64 6.3 78 6.5 91 6.1 65 4.2 140 6.7 122 5.8 162 7.7 115 5.2 144 7.2 91 4.6 99 5.1 IX 21 2.7 24 2.6 48 4.9 56 5.8 76 7.5 69 5.8 87 5.8 65 4.2 92 4.4 139 6.7 114 5.4 109 4.9 115 5.7 88 4.4 101 5.2 X 19 2.5 49 5.4 57 5.8 50 5.2 45 4.4 55 4.6 65 4.4 73 4.7 122 5.9 137 6.6 86 4.1 110 4.9 106 5.3 105 5.3 94 4.8 XI 34 4.4 43 4.7 57 5.8 55 5.7 55 5.4 34 2.8 56 3.8 55 3.6 133 6.4 148 7.1 142 6.7 142 6.4 121 6.0 118 5.9 114 5.8 XII 51 6.6 47 5.2 52 5.3 23 2.4 36 3.5 36 3 89 6 43 2.8 127 6.1 111 5.3 103 4.9 136 6.1 99 4.9 97 9.9 170 8.7 Total 770 100.0 909 100.0 983 100.0 958 100.0 1018 100.0 1194 100.0 1489 100.0 1548 100.0 2085 100.0 2087 100.0 2108 100.0 2231 100.0 2001 100.0 1992 100.0 1955 100.0 80 T. Przysucha et al. Calves are healthy and good developed and breeder bear the smallest rearing costs. It should also be noted that in the winter calvings weaning calves moment coincides with the impoverishment of pastures in autumn. the consequence is natural dry-off pregnant cows. With winter calvings cows mostly deliver in the barn so that it is easier to monitor deliveries and possible assistance in the event of complications. Analyzing the obtained results and assuming that the most favorable period of cows calving aptitude is the period from December to March. It should be noted that from 30.4 to 47.8% of the Polish Charolaise cows delivered in recent years during the relevant period cows. It follows that more than half of the calves born at other times of the year only to a small degree can take full advantage of the pasture. Table 12 shows the percentage distribution of calving aptitude of purebred Charolaise cows according to calving order. The greatest number of cows calved in the years of evaluation was TABLE 12. Distribution of the order of calvings Year Unit 2000 2001 2002 2003 2004 2005 2006 2010 2011 2012 2013 Months Total I II III IV V VI VII VIII IX X XI ≥ XII N 145 310 160 173 79 16 6 14 4 1 1 – 909 % 16.0 34.1 17.6 19.0 8.7 1.8 0.7 1.5 0.4 0.1 0.1 0.0 100.0 N 191 128 269 162 137 57 17 5 7 2 – – 975 % 19.6 13.1 27.6 16.6 14.1 5.8 1.7 0.5 0.7 0.2 0.0 0.0 100.0 N 207 137 114 217 122 97 33 14 7 7 2 – 957 % 21.6 14.3 11.9 22.7 12.7 10.1 3.4 1.5 0.7 0.7 0.2 0.0 100.0 N 252 180 115 94 173 97 73 22 5 3 3 1 1018 % 24.8 17.7 11.3 9.2 17.0 9.5 7.2 2.2 0.5 0.3 0.3 0.1 100.0 N 318 204 180 104 86 133 77 63 21 4 2 2 1194 % 26.6 17.1 15.1 8.7 7.2 11.1 6.4 5.3 1.8 0.3 0.2 0.2 100.0 N 412 285 188 163 84 87 106 64 66 24 7 3 1489 % 27.7 19.1 12.6 10.9 5.6 5.8 7.1 4.3 4.4 1.6 0.5 0.2 100.0 N 534 468 234 134 45 34 22 22 32 23 – – 1548 % 34.5 30.2 15.1 8.7 2.9 2.2 1.4 1.4 2.1 1.5 0.0 0.0 100.0 N 505 462 402 327 227 156 75 34 25 14 1 3 2231 % 22.6 20.7 18.0 14.6 10.1 6.9 3.3 1.5 1.1 0.6 0.0 0.1 100.0 N 405 390 335 295 213 163 98 48 24 23 6 1 2001 % 20.2 19.4 16.7 14.7 10.6 8.1 4.8 2.3 1.1 1.1 0.2 N 427 334 339 288 227 150 98 71 29 10 15 4 1992 % 21.4 16.7 17.0 14.4 11.3 7.5 4.9 3.5 1.4 0.5 0.7 0.2 100.0 N 372 338 273 275 238 193 127 58 49 19 5 8 1955 % 19.0 17.3 14.0 14.1 12.2 9.9 6.5 3.0 2.5 1.0 0.3 0.5 100.0 0.05 100.0 Analysis of results assessment of growth of Charolais beef cattle in Poland reported in primiparous cows and cows calving for the second time. It should be noted that in 2000 primiparous cows and the animals calving for the second time constituted more than 50% and in 2013 36.3% of the population. It means that the life of the cow increases, which is of particular economic importance. Long life of cows in herds of beef cattle is one of the main factors allowing for reducing the cost. so the breeders should try to use cows as long as possible. CONCLUSIONS One can observe a gradual decline in the share of the national Charolais beef cattle population. it also shows a significant decrease in the number of crossbreds with Charolais breed. The average weight of cows in 2005–2006 amounting to 559.4 and 570.2 kg meet the breeding standards for of cows entered in the initial part of the herd book. which define the minimum weight of Charolais cows after first calving as 550 kg. The average weight of heifers at birth in each year assessment was similar, but after 2008 began more than 40 kg. In purebred bulls it was seen a systematic increase in the average birth weight. The difference in birth weights between heifers and bulls ranged from 1 kg in 1999 to 3.6 kg in 2012. High average daily weight gains of bulls to 210 days of age, at short extra supplementary fattening period of about one month allow to export the animals weighing about 300 kg at an good price. The average daily gains of heifers (550–560 g), guarantee obtaining at 15 months of age body weight allowing the commencement of breeding. It should be noted 81 that the Polish Charolais cows in recent years during the relevant period from 30.4 to 47.8% of cows. REFERENCES ANDERSEN B.B., 1978: Animal size and efficiency. with special reference to growth and feed conversion in cattle. Anim. Prod. 27: 381–391. BROWN C.J., JOHNSON Z.B., BROWN A.H. jr., 1989: Between and within breed variation in mature weight and maturing interval of beef cattle. J. Anim. Sci. 67 (Suppl.) 2: 9. DOBICKI A., 1995: Technologiczne aspekty efektywności produkcji w populacjach mięsnych bydła. Zeszyty Naukowe Przeglądu Hodowlanego 17: 57–71. DOBICKI A., 1996: Hodowla i użytkowanie bydła ras mięsnych. Chów Bydła 11: 19–21. GRODZKI H., 1999: Chów bydła mięsnego. Wieś Jutra 7–8: 29–30. JASIOROWSKI H., 1999: Blaski i cienie hodowli bydła mięsnego w Polsce. Wieś Jutra 7–8: 27–28. JASIOROWSKI H., KIJAK Z., POCZYNAJŁO S., WAJDA S., 1996: Program rozwoju hodowli bydła mięsnego w Polsce. Fundacja „Rozwój SGGW”: 5–67. JASIOROWSKI H., PRZYSUCHA T., 2004: Bydło mięsne: wybór rasy. Top Agrar Polska 1: 102–104. Krajowe Centrum Hodowli Zwierząt, 1997–2000: Ocena wartości użytkowej krów oraz ocena i selekcja buhajów. Wyniki za lata 1996–1999. Polski Związek Hodowców i Producentów Bydła Mięsnego, 2001–2014: Ocena wartości użytkowej bydła ras mięsnych. Wyniki za lata 2000– –2013. PRZYSUCHA T., CZARNECKI vel SARNECKI M., GRODZKI H., ZDZIARSKI K., 2002b: The influence of selected factors on body weight and daily gains of Angus calves. Rocz. Nauk. Zoot. (Suppl.) 15: 225–230. PRZYSUCHA T., CZARNECKI vel SARNECKI M., GRODZKI H., ZDZIARSKI K., 2002a: Analiza wpływu wybranych czynników na tempo wzrostu cieląt rasy hereford. Zesz. Nauk. Przegl. Hod. 60: 233–243. 82 T. Przysucha et al. PRZYSUCHA T., GRODZKI H., CHARŁAMPOWICZ A., ZDZIARSKI K., 2002c: The effect of selected factors on growth rate of Limousine calves. Anim. Sci. Pap. Rep. 20. (Suppl.) 1: 221–228. PRZYSUCHA T., GRODZKI H., NAŁĘCZ-TARWACKA T., ZDZIARSKI K., 2002d: Analiza wpływu wybranych czynników na masę ciała i przyrosty cieląt rasy charolaise. Zesz. Nauk. Przegl. Hod. 62: 203–210. PRZYSUCHA T., GRODZKI H., PRAWDZIK B., SLÓSARZ J., ZDZIARSKI K., 2003: Analiza wpływu wybranych czynników na masę ciała i przyrosty cieląt rasy piemontese. Rocz. Nauk Zoot. (Supl.) 17: 881–884. Streszczenie: Analiza wyników oceny wzrostu bydła charolaise w Polsce. Celem pracy była analiza wybranych wyników oceny użytkowości francuskiej rasy charolaise w odniesieniu do ich zgodności z celem hodowlanym i standardami rasowymi przyjętymi przez PZHiPBM. Przedmiotem analiz były wyniki oceny użytkowości francuskiej rasy bydła mięsnego charolaise w Polsce. Opracowanie oparte jest na danych Polskiego Związku Hodowców i Producentów Bydła Mięsnego (PZHiPBM) za lata 2002–2013 oraz Krajowego Centrum Hodowli Zwierząt (KCHZ) za lata 1996–2001. Zbiór danych obejmował: N – liczbę badanych zwierząt, min. – minimalne wartości w badanej cechy, max. – maksymalne wartości badanej cechy, średnia – uśrednione wartości badanej cech, SD – odchylenie standardowe. Oceniane cechy to: średnie masy ciała krów (kg), średnie masy ciała cieląt po urodzeniu (kg), średnie przyrosty dobowe do wieku 210 dni (g), średnie masy ciała cieląt w wieku 210 dni (kg), średnia mleczność krów (kg), terminy ocieleń krów i jałowic, rozkład populacji krów według kolejności ocielenia. Można zaobserwować stopniowy spadek udziału rasy charolaise w krajowej populacji bydła mięsnego. Widać również znaczący spadek liczby mieszańców z rasą charolaise. Średnie masy krów w latach 2005–2006, wynoszące odpowiednio 559,4 i 570,2 kg, spełniają standardy hodowlane dla krów wpisywanych do części wstępnej księgi hodowlanej, które określają minimalną masę ciała krowy rasy charolaise po 1. ocieleniu jako 550 kg. Średnia masa ciała przy urodzeniu jałówek w poszczególnych latach oceny była zbliżona, ale po 2008 roku zaczęła przekraczać 40 kg. U buhajków czystorasowych widać systematyczny wzrost średniej masy urodzeniowej. Różnica średnich mas urodzeniowych między jałówkami a buhajami wynosiła od 1 kg w 1999 roku do 3,6 kg w 2012 roku. Wysokie średnie przyrosty dobowe masy ciała buhajków do 210. dnia życia pozwalają przy niedługim, dodatkowym, uzupełniającym okresie opasu, wynoszącym około jednego miesiąca, sprzedaż na eksport za korzystną cenę opasów o masie ciała około 300 kg. Uzyskane średnie dobowe przyrosty cieliczek dają gwarancję, że dalsze żywienie gwarantujące przyrosty dobowe w granicach 550–560 g pozwolą na uzyskanie przez nie w wieku 15 miesięcy masy ciała pozwalającej na rozpoczęcie użytkowania rozpłodowego. W polskich stadach bydła charolaise cieliło się w ostatnich latach we właściwym okresie od 30,4 do 47,8% krów. MS received May 2015 Authors’ address: Tomasz Przysucha Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW ul. Ciszewskiego 8, 02-786 Warszawa Poland e-mail: [email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 83–94 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Analysis of Limousine beef cattle recording results in Poland TOMASZ PRZYSUCHA, MARCIN GOŁĘBIEWSKI, HENRYK GRODZKI, KAROLINA WNĘK, JAN SLÓSARZ, MAŁGORZATA KUNOWSKA-SLÓSARZ, PIOTR TOKARSKI Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Abstract: Analysis of Limousine beef cattle recording results in Poland. The aim of the study was to assess the utility of selected results of the French Limousine breed with respect to their compliance with the breeding goal and standards adopted by the Polish Association of Breeders and Producers of Beef Cattle (PABPBC). The subject of the analysis were the results of the assessment of recording results of the French Limousine breed in Poland. The study is based on data for the years 2002–2013 of PABPBC and the National Center of Animal Breeding (NCAB) for 1996–2001. The data set included: N – the number of animals tested, min. – minimum values in the studied traits, max. – maximum value of the selected traits, average – average values of the analyzed traits, SD – standard deviation. Evaluated traits are: average weight of cows (kg), average body weight of calves after birth (kg), average daily gains for age 210 days (g), average body weight of calves at the age of 210 days (kg), average milk yield (kg), terms of cows and heifers calving aptitude, distribution of the population according to the order of calving cows. The share of purebred and crossbred Limousine cows in the national beef cattle population is dominant and in 2013 constituted 81.2%. The average body weight of cows do not depart from the masses assumed to culture. Higher birth weight bulls had reached in 2013. Weight of 37.5 kg. The difference between bulls and heifers was 3 kg. Calves were characterized by high body weight daily gains during rearing: 900–1009 g respectively for heiferss and 973–1088 g for the bulls. It should be noted that since 2002 bulls exceeded daily gains of 1000 g. The Polish Limousine cattle herds in recent years from 30.1 to 44.7% of cows calved during the relevant period. Thanks to the consistent growth of the population of Limousine, primiparous cows and cows calving for the second time amounted to about 40% of the population, despite the growing number of older cows. In 2000, only 2 cows were after 7 calvings, and in 2013 there were 1416 already (12.6%). It mean that the life of the cow increases, which is of particular economic importance. Key words: beef cattle, Limousine, beef cattle recording INTRODUCTION Currently in Poland there are registered 14 specialized breeds of beef cattle for which records are kept and evaluation of breeding value is conducted. Herdbook and recording assessment are conducted by the Polish Association of Breeders and Producers of Beef Cattle (PABPBC). PABPBC breeding goal for Limousine breed is to maintain high performance slaughter parameters, good weight, ease of calving course maintaining and improving weight gain of calves as an indicator of maternal milk production. The parameters for the growth of adult cows – body weight of 600–650 kg with a height of 135 cm in sacrum, bulls – body 84 T. Przysucha et al. weight 1100 kg with height of 145 cm in sacrum. In the national breeding program for Limousine cattle there are defined, inter alia, the following breeding standards for cows entered in the introductory part of the book: the minimum weight gain from birth to 210 days of age – 850 g, the minimum weight after first calving – 480 kg. The aim of the study was to assess selected recording results of the French Limousine breed with respect to their compliance with the breeding goal and standards adopted by PABPBC. MATERIAL AND METHODS The subject of the analysis were beef cattle recording results for the French Limousine breed in Poland. with respect to their compliance with the goal of racial breeding and standards adopted by the Polish Association of Breeders and Producers of Beef Cattle (PABPBC). The subject of the analysis were recording results of the Limousine beef cattle breed in Poland. The study was based on data for the years 2002–2013 of PABPBC and the National Center of Animal Breeding (NCAB) for 1996–2001. The data set included: N – number of animals tested, min. – minimum values in the studied traits, max. – maximum value of the selected features, average – average values of the analyzed traits, SD – standard deviation. Evaluated properties are: average weight of cows (kg), the average body weight of calves after birth (kg), the average daily gains for age 210 days (g), the average body weight of calves at the age of 210 days (kg), the average milk yield (kg), the terms of cows and heifers calving aptitude, the distribution of the population according to the order of calving cows. The calculation of standardized animal body weight for given day in its life was done according to the following formula: MCS = [(MCB – MCU) / WW] × × WS + MCU where: MCS – standardized animal body weight (kg); MCB – mean body weight of the animal on the actual weighing (kg); MCU – actual body weight set for 48 hours, at birth (kg); WW – mean age of the animal on the weighing (days); WS – standardized age of the animal (s). There were calculated the average daily weight gain of the animal from the day of birth to 210 days of age, according to the formula: PDMC = [(MCC – MCP) × × 1000] / (WK – WP) where: PDMC – means of increase in daily body weight (g); MCC – final body weight of the animal on the weighing day (kg); MCP – initial body weight of the animal on the weighing (kg); WK – mean age of the animal on the final weighing (days); WP – mean age of the animal on the initial weighing (days milk yield in dairy cows is expressed in kg of milk per convention. Analysis of Limousine beef cattle recording results in Poland The conversion 210 day lactation and is calculated according to the formula: WMM210 = (McOds × 1700) / calf age where: WMM210 – value of mother milk – milk yield for 210 day lactation conversion assuming calf birth weight 35 kg, per 1 kg body weight gain, which drank 10 kg milk a day during the first 3 months, and the remaining months of 8–9 kg a day; McOds (kg) – actual weight of the calf at weaning; calf age (days) – actual age of the calf at the time of weaning from the mother. 85 RESULTS AND DISCUSSION Table 1 presents the quantitative changes of the female population of Limousine cattle in Poland in the years 1996–2013. It may be noticed a systematic increase in population from 1998 to 2006, while in 2007, a noticeable decrease. The reason is not a drastic decrease in the number of purebred cows and heifers, but the changes in the presentation of results. Until 2006 statement included heifers and cows, while in 2007, is given only the number of cows. The share of purebred and crossbred Limousine cows in the national beef cattle population is dominant and in 2013 constituted 81.2%. TABLE 1. Quantitative changes of the female population of Limousine cattle in Poland* Beef breed female population Year Limousine breed (purebred) Limousine breed (crossbred) Limousine breed (purebred + + crossbred) Limousine breed share in the population pure-bred crossbred 1996 3 939 4 952 8 891 1 109 3 211 4 320 48.6 1997 6 063 5 772 11 835 1 846 3 344 5 190 43.9 1998 7 227 7 601 14 828 2 362 4 314 6 676 45.0 1999 8 375 8 243 16 618 2 882 4 919 7 801 46.9 2000 9 085 9 468 18 553 3 226 6 176 9 402 50.7 2001 9 129 9 748 18 877 3 159 6 837 9 996 53.0 2002 9 735 8 968 18 703 3 248 6 564 9 812 52.5 total 2003 11 768 9 382 21 150 4 653 6 925 11 578 54.7 2004 13 884 10 925 24 809 5 684 8 125 13 809 55.7 2005 17 130 11 710 28 840 8 578 9 073 17 651 61.2 2006 19 597 13 100 32 697 9 689 10 108 19 797 60.5 2007 14 541 11 676 26 217 7 443 9 070 16 513 63.0 2008 17 481 12 097 29 578 9 856 10 142 19 998 67.6 2009 15 435 7 711 23 146 9 995 6 682 16 677 72.1 2010 16 436 7 576 24 012 11 037 6 684 17 721 73.8 2011 16 216 7 459 23 675 11 310 6 653 17 963 75.9 2012 16 724 7 070 23 794 11 879 6 389 18 268 76.8 2013 17 481 6 633 24 114 12 586 6 987 19 573 81.2 *From 2007 the list includes only the cows. 86 T. Przysucha et al. The average body weight of purebred cows is shown in Table 2. Optimum weight and dimensions depend mainly on cattle production system (Morris and Wilton 1976, Andersen 1978, Dickerson 1978, Fitzhugh 1978, Nogalski et al. 2000). Genotype and weight of mother cows are always described among the many factors responsible for normal growth and development of calves. Many studies have shown that the weight of the cow has a significant impact on calf birth weight, as well as daily gains during rearing (Przysucha et al. 2002). Therefore, the weight of a cow in adulthood is an important feature to be considered for breeding programs (Anderson 1978, Brown et al. 1989). According to the breeding goal of PABPBC, cows body weight in adulthood should be 600– –650 kg for Limousine breed. Analysis of the recording results shows that the average body weight of cows did not differ from the breeding goal. to a calf body weight at weaning at the age of 210 days. The calves with highest body weight at birth also typically have the highest body weight at the end of the rearing (Przysucha et al. 2002, Przysucha et al. 2005). Bulls had reached higher birth weight in 2013 (37.5 kg). The difference between bulls and heifers was 3 kg. Nogalski et al. (2000) reported a greater number of falls of small, less vital calves. They also noticed that the mothers of dead calves were significantly lighter and in worse condition, and consequently created worse conditions for the development of the fetus, and were less prepared to make the effort in delivery. Average daily weight gains of purebred calves to the age of 210 days are shown in Tables 5 and 6. The data presented show that the calves were characterized by high body weight gains during rearing: 900–1009 g respectively for heifers and 973–1088 g for the bulls. It should be noted that since 2002 bulls TABLE 2. Body weight of purebred Limousine cows Year N 1999 Cow body weight (kg) min. max. average SD 1126 350 900 634.0 73.0 2000 1504 382 890 619.1 76.0 2001 1568 430 890 618.0 72.1 2002 1557 370 850 606.2 76.7 2003 1999 420 850 596.6 73.0 2004 2190 320 850 597.1 71.7 2005* 733 480 710 543.2 33.5 2006* 1489 440 796 552.1 36.1 *Body weight after first calving Tables 3 and 4 present the mean body weight of purebred calves after birth. Many authors have shown a significant effect of calves body weight after birth exceeded daily gains of 1000 g. These gains make, that after a short (about 1 month) supplementary fattening, bulls with a body weight of about 300 kg Analysis of Limousine beef cattle recording results in Poland TABLE 3. Average body weight of purebred heifers at birth Year N 1999* 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 1284 650 736 785 939 1036 1784 2935 3377 4705 5522 5732 5936 6466 6107 min. 16 22 17 20 20 17 15 17 19 16 20 15 15 15 14 Body weight (kg) max. average 67 34.3 55 33.1 58 34.6 55 34.7 60 33.7 49 33.4 48 33.1 50 34.7 55 33.5 58 34.2 56 34.3 57 34.3 54 34.4 57 34.5 56 34.5 SD 5.9 5.2 5.0 4.4 4.2 3.9 3.8 3.4 4.2 4.1 4.2 3.9 3.9 4.1 4.2 *Regardless of sex. TABLE 4. Average body weight of purebred bulls at birth Year N 1999* 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 1284 655 716 723 994 1103 1745 2774 2924 4249 4995 5349 5506 5879 5626 *Regardless of sex. min. 16 18 18 23 20 15 18 20 20 16 20 18 20 20 15 Body weight (kg) max. average 67 34.3 57 34.5 53 36.2 52 36.0 50 35.3 50 35.3 52 35.3 55 36.2 65 35.7 61 36.8 60 37.0 65 37.2 65 37.4 70 37.7 60 37.5 SD 5.9 6.4 5.5 4.7 4.3 4.4 4.1 4.2 4.8 4.5 4.6 4.5 4.4 4.4 4.6 87 88 T. Przysucha et al. TABLE 5. Average daily gains of purebred heifers to 210 days of age Year N 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 241 497 494 641 654 1 007 1 574 2 544 4 202 4 999 5 430 5 381 5 932 5 632 min. 550 518 494 429 417 510 509 401 343 351 372 489 332 332 Daily gains (g) max. average 12 989 900.4 1 495 954.8 1 421 915.5 1 619 937.8 1 514 974.2 1 686 991.5 1 389 1 005.0 2 241 959.9 1 611 963.0 1 482 964.9 1 548 967.8 1 480 983.3 1 676 1 009.7 1 676 1 000.9 SD 136.2 163.9 124.3 142.2 122.1 136.5 99.9 126.6 126.4 124.7 106.9 88.7 63.6 133.7 TABLE 6. Average daily gains of purebred bulls to 210 days of age Year N 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 280 463 369 603 692 834 1 624 2 011 3 671 4 359 4 677 4 681 5216 5053 min. 617 522 546 541 541 420 381 417 474 348 405 346 346 378 previously eliminated from breeding can be sold for export at a good price. The gains considerably in excess of the gains of heifers defined in the breeding standard ensure that after weaning with proper nutrition they obtain the required Daily gains (g) max. average 1 446 973.7 1 478 986.8 1 427 1 007.1 1 575 1 014.9 1 452 1 047.8 1 748 1 088.5 2 324 1 064.1 1 828 1 064.2 1 835 1 051.1 1 693 1 051.6 1 599 1 051.2 1 746 1 071.4 1 746 1 076.6 1 913 1 094.6 SD 164.4 177.8 122.3 152.4 125.7 155.4 152.1 137.5 128.6 121.7 116.2 88.6 46.8 152.1 body weight for mating (Przysucha et al. 2006) at the age of 15 months. Among the Limousine breed calves there is very low percentage of mortality by as much as 3% lower in the French breeding conditions. Besides they are characterized Analysis of Limousine beef cattle recording results in Poland by rapid growth and development, and vitality (Przysucha et al. 2005). In study of Pogorzelska et al. (1998) Limousine bulls daily gains from birth to weaning were more than 1000 g, and at the age of 3–4 months obtained body weight of approximately 170 kg. It should be emphasized that the average daily gains of calves ranged considerably in the last years of assessment. This is confirmed by the high standard deviations. The average body weight of purebred calves at 210 days of age are presented in Tables 7 and 8. The body weights at the time of weaning were at the level of the 222–253 kg for heifers and 238– –274 kg for bulls. The highest weight at the age of 210 days for heifers was reached in 2006 and for the bulls in 2007. The studies lead to the conclusion that by the breeding standards weights at weaning for both heifers and bulls were at medium level, but fall within the French standards. The average weight of bulls was evaluated by approximately 20 kg higher than the average weight of heifers of the same age. Table 9 shows the average milk yield of purebred cows in different years of assessment. As can be seen from the following statement, the average milk yield of Limousine cows was 2002.4 kg in the last year of the assessment and did not undergo significant changes in subsequent years. The minimum value of this trait was 640 kg and the maximum 3312 kg. The data should be approached with great caution because milk yield was calculated based on the weight gain of calves, and as we know in the herd calves can always be found that approach to other cows choke or are fed by the breeder. For this reason, since 2010, evaluation of this feature was a ceased. TABLE 7. Average body weight of purebred heifers at 210 days of age Year N 1999* 2000 Body weight (kg) min. max. average SD 873 70 213 140.6 21.5 241 149 315 221.7 29.7 2001 499 155 347 237.2 34.3 2002 497 128 329 227.0 26.8 2003 642 120 370 230.2 30.6 2004 654 118 350 238.2 26.4 2005 1007 110 380 241.6 29.1 2006 1574 120 397 246.2 34.3 2007 2544 103 395 236.4 31.5 2008 4202 127 371 237.7 32.5 2009 4999 110 398 240.1 32.8 2010 5430 120 500 239.0 31.4 2011 5381 122 365 247.1 22.3 2012 5918 104 401 253.3 13.7 2013 5632 135 410 251.7 11.7 *Regardless of sex. 89 90 T. Przysucha et al. TABLE 8. Average body weight of purebred bulls at 210 days of age Year N 1999* 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 873 280 466 370 608 692 834 1624 2011 3671 4359 4677 4681 5216 5053 min. 70 162 153 143 146 142 119 113 120 150 119 126 128 138 107 Body weight (kg) max. average 213 140.6 351 238.5 348 245.5 336 247.5 363 248.0 339 255.4 393 246.3 430 249.0 450 260.7 406 258.7 440 261.6 430 259.4 420 269.2 431 271.5 450 274.7 SD 21.5 36.6 37.8 27.6 32.6 27.1 33.6 48.9 36.1 34.8 34.3 33.6 28.1 11.7 33.6 Estimated milk yield of cows (kg) max. average 3 250.0 1 884.8 3 311.9 1 951.4 2 833.3 1 914.2 2 995.2 1 933.8 2 833.1 1 999.8 2 395.0 1 881.0 3 087.0 2 069.2 2 958.0 2 002.4 SD 315.9 354.1 232.4 265.6 227.5 206.5 238.6 231.6 *Regardless of sex. TABLE 9. The average milk yield of purebred cows Year N 2000 2001 2002 2003 2004 2005 2006 2009 858 795 796 1 249 1 346 1 628 3 205 9 157 min. 745.0 1020.0 971.4 971.4 951.9 640.0 1 009.0 899.0 Table 10 summarizes the terms of cows and heifers calving aptitude in the coming months in the year, in the years 1999–2013. Season of birth has a significant impact on the vitality and growth pace of reared calves. which directly affects the economic effects of the rearing (Makulska et al. 2002, Przysucha et al. 2005). Seasonality in calvings in breeding herds is very important. because appropriate term of calving in the future allows to receive breeding material of a very good quality with the least amount of cost of rearing (maximum utilization of pastures). Many authors believe (Dobicki 1996, Jasiorowski 1999, Jasiorowski and Przysucha 2004). that the period Analysis of Limousine beef cattle recording results in Poland 91 TABLE 10. Time of purebred cows and heifers calving Year Unit 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Months Total I II III IV V VI VII VIII IX X XI XII N 127 127 172 177 171 103 101 71 58 81 68 73 1329 % 9.6 9.6 12.9 13.3 12.9 7.8 7.6 5.3 4.4 6.1 5.1 5.5 100.0 N 107 135 235 191 166 115 111 88 70 95 83 122 1518 % 7.0 8.9 15.5 12.6 10.9 7.6 7.3 5.8 4.6 6.3 3.5 8.0 100.0 N 174 156 203 211 159 104 123 110 79 84 83 90 1576 % 11.0 9.9 12.9 13.4 10.1 6.6 7.8 7.0 5.0 5.3 5.3 5.7 100.0 N 148 142 214 244 182 135 79 97 89 71 85 84 1570 % 9.4 9.0 13.6 15.5 11.6 8.6 5.0 6.2 5.7 4.5 5.4 5.4 100.0 N 147 236 276 279 241 191 150 96 73 96 91 126 2002 % 7.3 11.8 13.8 13.9 12.0 9.5 7.5 4.8 3.6 4.8 4.5 6.3 100.0 N 165 177 323 336 233 223 172 111 124 131 89 107 2191 % 7.5 8.1 14.7 15.3 10.6 10.2 7.9 5.1 5.7 6.0 4.1 4.9 100.0 N 232 356 435 325 365 286 245 216 220 152 122 156 3110 % 7.5 11.4 14.0 10.5 11.7 9.2 7.9 6.9 7.1 4.9 3.9 5.0 100.0 N 750 768 843 567 332 456 567 456 312 345 123 190 5709 % 13.1 13.5 14.8 9.9 5.8 8.0 9.9 8.0 5.5 6.0 2.2 3.3 100.0 N 389 484 678 893 800 624 497 428 464 447 389 403 6496 % 6.0 7.5 10.4 13.7 12.3 9.6 7.7 6.6 7.1 6.9 6.0 6.2 100.0 N 531 673 927 936 1085 787 481 485 484 424 404 406 7623 % 7.0 8.8 12.2 12.3 14.2 10.3 6.3 6.4 6.4 5.6 5.3 5.3 100.0 N 670 676 1087 1335 1208 805 596 560 500 459 590 581 9067 100.0 % 7.4 7.5 12.0 13.3 8.9 6.6 6.2 5.5 5.1 6.5 6.4 N 739 762 1175 1581 1201 14.7 835 694 591 550 447 533 580 9688 % 7.6 7.9 12.1 8.6 7.2 6.1 5.7 4.6 5.5 6.0 100.0 16.3 12.4 N 913 761 1195 1349 1417 1016 733 546 604 473 494 635 10136 % 9.0 7.5 11.8 14.0 10.0 7.2 5.4 6.0 4.7 4.9 6.3 100.0 13.3 N 953 942 1374 1491 1439 976 738 664 595 547 562 762 1043 % 8.6 8.5 12.4 8.8 6.7 6.0 5.4 5.0 5.1 6.9 100.0 N 1058 960 1257 1508 1337 1046 818 727 598 600 677 600 11186 % 9.5 8.6 11.2 7.3 6.5 5.3 5.4 6.1 5.4 100.0 13.5 13.5 13.0 12.0 9.4 of mating and the resulting of calving aptitude time should not be longer than 2–3 months. Beef cows maintained all year round in grazing system should make the best offspring in the winter. Calves born in the period after the completion of the first period of milk drinking are prepared to make full use of the pasture. then their growth rate is fast. calves are healthy and good developed 92 T. Przysucha et al. and breeder bear the smallest rearing costs. It should also be noted that in the winter calvings weaning calves moment coincides with the impoverishment of pastures in autumn. the consequence is natural dry-off pregnant cows. With winter calvings cows mostly deliver in the barn so that it is easier to monitor deliveries and possible assistance in the event of complications. Analyzing the obtained results and assuming that the most favorable period of cows calving aptitude is the period from December to March. It should be noted that from 30.1 to 44.7% of the Polish Limousine cows delivered in recent years during the relevant period cows. It follows that more than half of the calves born at other times of the year only to a small degree can take full advantage of the pasture. Table 11 shows the percentage distribution of calving aptitude of purebred Limousine cows according to calving order. Limousine breed is considered to be long-lived and early maturing breed. TABLE 11. Distribution of the order of calving Year Unit 2000 2001 2002 2003 2004 2005 2006 2010 2011 2012 2013 Months I II III IV V VI VII VIII IX X XI ≥ XII Total N 360 282 323 364 158 25 2 – – – – – 1514 % 23.8 18.6 21.3 24.0 10.4 1.7 0.1 – – – – – 100.0 N 363 299 222 274 278 124 12 2 – – – – 1574 % 23.1 19.0 14.1 17.4 17.7 7.9 0.8 0.1 – – – – 100.0 N 387 300 193 164 186 196 104 19 – – – – 1549 % 25.0 19.4 12.5 10.6 12.0 12.7 6.7 1.2 – – – – 100.0 N 474 369 353 218 191 156 146 67 12 – – – 1986 % 23.9 18.6 17.8 11.0 9.6 7.9 7.4 3.4 0.6 – – – 100.0 N 544 412 287 271 179 174 149 122 45 8 – – 2191 % 24.8 18.8 13.1 12.4 8.2 7.9 6.8 5.6 2.1 0.4 – – 100.0 N 919 573 412 326 268 166 148 149 102 40 7 – 3110 % 29.5 18.4 13.2 10.5 8.6 5.3 4.8 4.8 3.3 1.3 0.2 – 100.0 N 1484 1235 1123 943 345 359 56 76 56 12 8 12 5709 % 26.0 16.5 6.0 6.3 1.0 1.3 1.0 0.2 0.1 0.2 100.0 21.6 19.7 N 2362 2124 1960 1352 803 403 248 169 117 67 34 49 9688 % 24.3 8.2 4.1 2.5 1.7 1.2 0.6 0.3 0.4 100.0 21.9 20.2 13.9 N 2335 2090 1717 1586 1047 616 303 172 115 79 42 34 10 136 % 23.0 10.3 6.0 2.9 1.6 1.1 0.7 0.4 0.2 100.0 N 2564 1947 1756 1477 1396 834 482 273 135 77 53 49 11 043 % 23.2 17.6 15.9 13.3 7.5 4.3 2.4 1.2 0.6 0.4 0.3 100.0 N 2153 2110 619 1522 1262 1105 636 346 216 100 61 56 11 186 % 19.2 14.5 13.6 5.7 3.1 1.9 0.9 0.5 0.5 100.0 20.6 18.9 16.9 15.6 12.6 11.3 9.9 Analysis of Limousine beef cattle recording results in Poland Average life expectancy of cows is 8–11 years, and the number of calves born during the lifetime of a single cow an average 7 pieces. Cows of this breed very well take care of their offspring – are very good and caring mothers (Pogorzelska et al. 1998). It should be noted that due to the systematic increase in the population of Limousine breed cows, primiparous cows and cows calving for the second time constitute about 40% of the population, despite the growing number of older cows. In 2000, only 2 cows were after 7 calving, and in 2013 there were already 1416 (12.6%). It proves that the life of the cow increases. which is of particular economic importance. Long life of cows in herds of beef cattle is one of the main factors allowing for reducing the cost. so the breeders should try to use cows as long as possible. CONCLUSIONS Analysis of selected results of the evaluation of the French utility Limousine with regard to their compliance with the breeding goal and standards adopted by PABPBC shows maintenance of high standards of the national breeding population of this breed of cattle. 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KRAJOWE CENTRUM HODOWLI ZWIERZĄT, 1997–2000: Ocena wartości użytkowej krów oraz ocena i selekcja buhajów. Wyniki za lata 1996–1999. MAKULSKA J., WEGLARZ A., SZAREK J., 2002: Wpływ sezonu urodzenia na produkcyjno-ekonomiczne wyniki odchowu cieląt rasy limousinee. Rocz. Nauk. Zoot. (Supl.) 15: 213–218. MORRIS C.A., WILTON J.W., 1976: The influence of body size on the biological efficiency of cows: A review. Can. Anim. Sci. 56: 613–647. NOGALSKI Z., KLUPCZYŃSKI J., MICIŃSKI J., 2000. Przebieg porodu, wielkość i żywotność cieląt w zależności od wymiarów ciała krów. Rocz. Nauk. Zoot. 27 (3): 43–57. POGORZELSKA J., ROMANOWSKI A., PUCHAJDA Z., 1998: Analiza użytkowania rozpłodowego i rozwój importowanego z Francji bydła limousinee i charolaise. Zesz. Nauk. AR we Wrocławiu XIX (336): 143–148. Polski Związek Hodowców i Producentów Bydła Mięsnego, 2001–2014: Ocena wartości użytkowej bydła ras mięsnych. Wyniki za lata 2000–2013. PRZYSUCHA T., GRODZKI H., BRZOZOWSKI P., ZDZIARSKI K., 2005: Wpływ wybranych czynników na przebieg porodów krów rasy limousine. Medycyna Weterynaryjna 61 (9), 1036–1038. PRZYSUCHA T., GRODZKI H., CHARŁAMPOWICZ A., ZDZIARSKI K., 2002: The effect of selected factors on growth rate of Limousinee calves. Anim. Sci. Pap. Rep. 20, (Suppl.) 1: 221–228. 94 T. Przysucha et al. STĄPOREK K., ZIEMIŃSKI R., 2006: Aktualne trendy w chowie i hodowli rasy Limousine. Przegl. Hod. 7: 1–4. Streszczenie: Analiza wyników oceny użytkowości francuskiej rasy limousine w Polsce. Celem pracy była analiza wybranych wyników oceny użytkowości francuskiej rasy limousine w odniesieniu do ich zgodności z celem hodowlanym i standardami rasowymi przyjętymi przez Polski Związek Hodowców i Producentów Bydła Mięsnego. Przedmiotem analiz były wyniki oceny użytkowości francuskiej rasy bydła mięsnego limousine w Polsce. Opracowanie oparte jest na danych PZHiPBM za lata 2002–2013 oraz Krajowego Centrum Hodowli Zwierząt (KCHZ) za lata 1996–2001. Zbiór danych obejmował: N – liczbę badanych zwierząt, min. – minimalne wartości w badanej cechy, max. – maksymalne wartości badanej cechy, średnia – uśrednione wartości badanej cech, SD – odchylenie standardowe. Oceniane cechy to: średnie masy ciała krów (kg), średnie masy ciała cieląt po urodzeniu (kg), średnie przyrosty dobowe do wieku 210 dni (g), średnie masy ciała cieląt w wieku 210 dni (kg), średnia mleczność krów (kg), terminy ocieleń krów i jałowic, rozkład populacji krów według kolejności ocielenia. Udział czystorasowych i mieszańcowych krów rasy limousine w krajowej populacji bydła mięsnego jest dominujący i w 2013 roku stanowił 81,2%. Średnie masy ciała krów nie odbiegają od mas założonych w celu hodowlanym. Większą masą urodzeniową miały buhajki, osiągając w 2013 roku wagę 37,5 kg. Różnicą między buhajkami a jałówkami wynosiła 3 kg. Cielęta charakteryzowały się dużymi przyrostami w okresie odchowu: 900–1009 g odpowiednio dla cieliczek i 973–1088 g dla buhajków. Należy zauważyć, iż od 2002 roku buhajki przekroczyły 1000-gramowe przyrosty dobowe. W polskich stadach bydła limousine cieliło się w ostatnich latach we właściwym okresie od 30,1 do 44,7% krów. Dzięki systematycznemu wzrostowi populacji krów rasy limousine pierwiastki i krowy cielące się po raz drugi stanowią około 40% populacji, mimo stale rosnącej liczby krów starszych. W 2000 roku tylko 2 krowy były po 7. ocieleniu, a w 2013 roku było ich już 1416 (12,6%). Wynika z tego, że wydłuża się czas użytkowania krów, co ma szczególne znaczenie ekonomiczne. MS received May 2015 Authors’ address: Tomasz Przysucha Wydział Nauk o Zwierzętach SGGW ul. Ciszewskiego 8 02-786 Warszawa Poland e-mail: [email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 95–104 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Influence of lactation stage on selected blood parameters and biological value of cow milk during pasture season in organic system of production TOMASZ SAKOWSKI1, KAMILA PUPPEL2, MARCIN GOŁĘBIEWSKI2, BEATA KUCZYŃSKA2, EWA METERA1, GRZEGORZ GRODKOWSKI2 Department of Animal Science, Institute of Genetics and Animal Breeding, Polish Academy of Science 2 Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW 1 Abstract: Influence of lactation stage on selected blood parameters and biological value of cow milk during pasture season in organic system of production. The disproportion between the cow’s genetically determined ability to produce milk and the limits to improving the energy value of feed may be the cause of the metabolic stress of animals kept at organic farms. Negative energy balance has a major impact on the body’s hormonal balance and the function of the organs; it also affects the content of basic components (protein, fat and lactose) in cows’ milk. The aim of the study was to investigate changes in the biological value of organic milk obtained from high producing dairy cows at different stages of lactation during pasture season. The study was carried out on 68 Polish Holstein-Friesian primiparous. 272 milk samples were collected from cows which were in one of the following phases: the beginning of lactation (BL): 5–30 days post partum; peak of lactation (PL): 60–90 days post partum; full lactation (FL): 120–150 days post partum; end/final phase of lactation (EL): 250 days post partum. Stage of lactation had an overriding effect on the majority of analyzed milk constituents including: whey proteins, vitamins soluble in fat, phospholipids and fatty acids. The highest levels of lactoferin were found at the beginning of lactation (BL). At the same time, the β-hydroxybutyrate (BHBA) concentration increased, which confirmed that the fast growing milk yield at the peak of lactation is linked to an increase in energy demand. The lowest alanine aminotransferase and non esterified fatty acids activity was measured during BL. The study has shown a significant influence of lactation stage on the biological value of organic milk obtained from high producing dairy cows during pasture season. In addition, there is evidence that the organic production system has no influence on the metabolic profile of cows as the plasma parameters were within their standard norms. This might be the result of the positive effect of grass antioxidants. Key words: cow’s milk, lactation stage, organic system INTRODUCTION Recent studies have pointed out significant differences in the chemical composition and nutritional quality of milk and dairy products between organic and conventional farming systems (Bisig et al. 2007). Previous studies stated that the feeding regime had a major effect on the FA profiles of milk (Dewhurst et al. 2006, Elgersma et al. 2006) but that other factors (including breed, genotype or both, the stage and number of lactations) may also influence milk composition (Walker 96 T. Sakowski et al. et al. 2004, Chilliard et al. 2007). One of the biggest issues in organic herds is to provide high yielding cows with sufficient amounts of nutrients to meet their needs while maintaining environmental standards for the composition of the ratio and type of feed (Hermansen 2003). In conventional farms negative energy balance usually appears at the beginning of lactation (Ingvartsen et al. 2003) and is associated with a simultaneous rapid increase in the milk productivity of animals and limited capacity for feed intake. Due to seasonal changes in the composition and quality of the feed cows from organic farms might also suffer an energy deficit in other stages of lactation. A more direct insight into the physiological state of the cow’s organism is provided by the concentration of certain metabolites in the blood plasma, milk or both. It was reported that the level of β-hydroxybutyric acid (BHBA) presented an accurate picture of the energy balance in grazing dairy cows. Moreover, there was a direct link between an excess of free radicals in cows’ organisms and decreased disease resistance. There are many components in plants that might prevent lipid peroxidation through limitation of free radicals, stimulation of antioxidant enzymes activity (i.e.: superoxide dismutase, catalase, glutathione peroxidase and glutathione reductase) or both. These properties strongly depend upon the presence of phenolic compounds in plants such as flavonoids, tannins, phenolic acids and terpenes, phenols as well as certain vitamins (i.e. E, C and A). Of all plant components the flavonoids, also called bioflavonoids, are the most powerful antioxidants. They have the ability to inhibit the enzymes responsible for the production of superoxide anions (i.e. xanthine oxidase, protein kinase C), as well as the chelation of transition metals; “cleaning up” free radicals and initiating and stimulating antioxidant protection of other factors. Flavonoids are predominantly found in legumes and especially grassland legumes such as clovers (Steinshamn et al. 2008). There is a direct relationship between the availability of excess free radicals and a decrease in animal disease resistance. Therefore, increasing the level of antioxidants in the diet of cows through pasturing is a natural way to stimulate the immune system of cows in organic production systems. The nutritional value of organic pastures is mainly associated with herbage variety (different species of grasses, legumes and herbs). The disproportion between the cow’s genetically determined ability to produce milk and the limitations on improving the energy value of the ration may be the cause of the metabolic stress of animals kept at organic farms. Negative energy balance has a major impact on the body’s hormonal balance and the functioning of the organs and it also affects the content of basic components (protein, fat and lactose) of milk cows. Physiological changes in the cow’s body, which occur during lactation, might have significant influence on the biological value of milk and milk products. Little is known about the influence of lactation stage on the chemical composition and biological value of organic milk obtained from high-yielding Holstein-Friesian cows during pasture season. The aim of the study was to investigate the influence of lactation stage on the Influence of lactation stage on selected blood parameters and biological value of cow milk... biological value of organic milk obtained from high producing dairy cows during pasture season. MATERIAL AND METHODS Animals The study was carried out on 68 Polish Holstein-Friesian primiparous cows at the Polish Organic Dairy Farm located in Juchowo (Western-Pomeranian Region). Juchowo Farm produces milk according to the legislation on organic farming issued by the Polish Ministry of Agriculture and Rural Development. All cows were handled in accordance with the regulations of the Polish Council on Animal Care, and the Polish Academy of Science Care Committee reviewed and approved the experiment and all procedures carried out in the study. Observations were conducted during two consecutive calendar years. 97 Treatments and pasture For better representation, only cows calved in the spring season (lactating on pasture) were chosen for the experiment. The nutritional requirements of the animals and the nutritive value of their diet were calculated in accordance with the nutritional standards set out in the INRATION 4.0 software. The nutrient composition of the feedstuffs and diet are presented in Tables 1 and 2. The feed intake for the organic production systems, including the pasture intake, was calculated according to standards based on the difference between herd demand and recorded intake of supplements. The use of additional vitamins as supplement to the feed was recorded. During the study, cows were stripgrazed on a multispecies pasture (Dactylis glomerata L., 12.8%; Phalaris arundinacea L., 4.2%; Agrostis stolonifera L., 5.8%; Poa pratensis L., 17.5%; TABLE 1. Nutrient composition of the diets at different stages of lactation Stage of lactation Component BL PL (5–30 days (60–90 days post partum) post partum) FL (120–150 days post partum) EL (250 days post partum) DM (%) 56.52 60.29 60.55 58.67 Crude protein (CP) (% of DM) 14.55 14.42 14.54 14.71 Acid detergent fiber (ADF) (% of DM) 24.40 29.11 29.76 28.50 Neutral detergent fiber (NDF) (% of DM) 38.84 39.35 41.42 41.83 Ether extract (% of DM) 3.86 3.98 4.30 3.89 Ash (% of DM) 5.76 6.38 6.02 5.86 Ca (% of DM) 0.53 0.48 0.51 0.47 P (% of DM) 0.35 0.36 0.36 0.37 UFL (kg of DM–1) 0.90 0.92 0.89 0.97 98 T. Sakowski et al. TABLE 2. Diet of experimental cow at various stage of lactation Stage of lactation Ingredient Pasture with legumines (% of DM) BL (5–30 days post partum) PL (60–90 days post partum) 71.42 58.84 63.67 Hay (% of DM) FL EL (120–150 days (250 days post post partum) partum) 79.30 – 12.07 18.86 7.42 Total roughage (% of DM) 71.42 70.91 82.53 86.72 Concentrates1 (% of DM) 27.64 28.05 16.50 12.27 Supplements2 (% of DM) 0.92 0.96 0.94 0.99 Total (offered) (kg of DM) 21.70 20.70 21.20 20.20 Daily intake (kg) 17.80 19.20 19.80 20.10 Concentrates: sum of cereals, by-products, and commercial concentrate mix. Supplements: calcium 18%, phosphorus 7%, sodium 8.2%, magnesium 4.5%, vitamin A 1,000,000 IU, vit. D3 100,000 IU, vitamin E 3000 mg, manganese 3000 mg, zinc 9000 mg, copper 1200 mg, iodine 100 mg, cobalt 20 mg, selenium 40 mg. 1 2 Lolium perenne L., 19.4%; Festuca rubra L., 7.3%; Trifolium repens, 9.4%; Poa annua, P. trivialis, 8.3%; and broadleaf weeds, 10.3%; others 5.0%) at 7 AM to 4 PM every day. The cows received other feed or mineral supplements before evening milking and had ad libitum access to fresh water. Measuring and sampling scheme Animal performance parameters. 272 milk samples were collected from cows which were in one of the following phases (LS): the beginning of lactation (BL): 5–30 days post partum; peak of lactation (PL): 60–90 days post partum; full lactation (FL): 120–150 days post partum; end or final phase of lactation (EL): 250 days post partum. The cows were milked daily at 5.30 AM and 5.30 PM and milk yield was recorded at each milking. During the experiment milk samples were obtained twice from each cow from the morning and evening milking (according to sampling scheme). Milk was placed in sterile bottles, preserved with Mlekostat CC and immediately submitted to the Cattle Breeding Division (Milk Testing Laboratory of WULS) for composition analysis. The basic parameters of the milk, i.e. fat, protein, lactose, urea content, were determined by automated infrared analysis with a Milkoscan FT – 120 instrument (Foss Electric; Hillerod, Denmark). An evaluation of the hygienic status of the milk was based on somatic cell count using the Somacount – 150 (Bentley, Warsaw, Poland). Whey proteins. The determination of lactoferrin concentration were established using an Agilent 1100 Series reverse phase high-performance liquid chromatograph (Agilent Technologies, Waldbronn, Germany) according to the methodology described by Puppel et al. (2014). Vitamins soluble in fat and β-carotene. Analysis of the fat soluble vitamins: β-carotene and α-tocopherol were established using an Agilent 1100 Influence of lactation stage on selected blood parameters and biological value of cow milk... Series reverse phase high-performance liquid chromatograph (Agilent Technologies, Waldbronn, Germany) and Zorbax Eclipse XDB C8 column (4.6 × × 150 mm, 5 μm film thickness) according to the method described by Puppel et al. (2013). Blood. Blood samples were collected from the animal’s tail vein by an authorized veterinarian (empty test tubes, for clotted blood, and test tubes containing lithium heparin were used). Blood was collected before the morning feeding. After collection the samples were transported on ice, at temperatures around 0–6°C. In the laboratory blood was centrifuged at 3500 RPM for 10 min and put to Eppendorf type tubes of 1.5 ml capacity, and then frozen at –30° C for further analysis. Levels of the following blood parameters were estimated with the help of UV-VIS spectrophotometer ULTROSPEC 2000 (PHARMACIA BIOTECH) in the blood serum probes: β-hydroxybutyric acid (BHBA), enzymatic method, the BHB RANBUT test (Randox), aspartate aminotransferase (AST), colorimetric method, AST test (Pointe Scientific) and alanine aminotransferase (ALT), colorimetric method, ALT test (Pointe Scientific), non-esterified fatty acids (NEFA), colorimetric method, NEFA test (Pointe Scientific). Statistical analysis The data obtained were analyzed statistically using a ANOVA procedure by means of the SPSS 12.0 packet software (SPSS, Chicago, IL, USA). The mathematical model that describes the influence of lactation stage on analyzed traits is given by 99 Yij = μ + τi + öij where: Yij – the j-th observation (j = 1, 2, …, ni); μ – common effect for the whole experiment; τi – the i-th lactation stage effect ((i = BL (5–30 days), PL (60–90 days), FL (120–150 days), EL (> 250 days)); öij – the random error present in the j-th observation on the i-th stage of lactation. The level of significance was determined after performing preliminary statistical analyses. RESULTS AND DISCUSSION Milk production is a function of the number and activity of mammary epithelial cells, regardless of lactation stage. The highest level of protein was observed in EL. A similar trend was noted in the case of fat concentration. This was probably due largely to the concentrating effect of decreasing milk volumes, since yields of fat and protein decreased with advancing lactation (Table 3). DePeters and Cant (1992) observed that the reduction in protein concentration in milk is often caused by the dilution effect, rather than its reduced synthesis in the mammary gland, and is always associated with an increase in milk yield. Similar results were reported by Auldist et al. (1998) and Dewhurst et al. (2006). The lowest fat, protein and dry matter content in PL was probably caused through the use of energy from adipose tissue in the BL (Pedron et al. 1993). At this time the cow cannot satisfy its energy needs from feed intake alone, which is still too small 100 T. Sakowski et al. TABLE 3. Changes in milk performance of analyzed cows during different stages of lactation Stage of lactation Item Sample number BL (5–30 days post partum) PL (60–90 days post partum) FL (120–150 days post partum) EL (250 days post partum) LSM1 (SEM2) LSM (SEM) LSM (SEM) LSM (SEM) 68 68 68 68 22.7Ac (3.05) 23.5Bd (3.58) 18.3cd (3.21) 15.8AB (3.59) 42.8a (1.1) 38.5b (1.30) 43.4a (1.40) 43.5 (1.60) 30.9 (0.40) 29.3 (0.50) 30.5A (0.50) 33.1B (0.60) 46.9 (0.20) 47.6 (0.30) 47.1 (0.30) 47.5 (0.40) Somatic cell count (10 ·ml ) 95.72 (12.59) 53.09 (11.47) 62.66 (13.25) 69.82 (12.89) Urea (mg·l–1) 270.5a (18.45) 285.4 (20.32) 279.1 (21.45) 259.5a (23.65) Milk yield (kg·d–1) Fat (g·kg–1) Protein (g·kg ) –1 Aa Lactose (g·kg–1) 3 –1 a Ab a SEM – standard error of the mean; 2 LSM – least square of mean; values in the same row marked with the same letters differ significantly AA, BB at P ≤ 0.01; aa, bb at P ≤ 0.05. 1 (Reist et al. 2002) in this lactation phase. Milk lactose percentages were, however, very similar for all periods. The content of lactose in milk is subject to the smallest changes. The higher content of lactose in organic milk can be explained by the higher concentrations of sugar in feed grasses on organic farms. In BL cows primarily mobilize body fat. Nevertheless, a limited amount of body proteins will be mobilized as well and can result in elevated plasma urea concentrations. The content of urea is influenced by the following factors: feed composition and dose, the weight of cows, milk yield, season, month and lactation period. During pasture feeding high levels of urea can be tolerated and even economically justified. Cows grazed ad libitum on young pasture (excess of easily degradable protein) consume much more protein than they can turn into milk. Therefore, the pasture grazing cows may produce milk with a high level of urea (even higher than 300 mg·l–1). The urea content in organic milk samples ranged between 259.5 and 270.5 mg·l–1 (Table 3). Urea and protein content in milk are indicators of a diet balanced in terms of energy and protein, so if the protein content is within normal ranges (3.2–3.8%), and urea concentration is between 15–30 mg and 100 m·l–1, it is considered that the energy and crude protein supply are at an optimum level (Bendelja et al. 2011). The main source of fat-soluble vitamin in milk fat is feed. The concentration of β-carotene in milk depends on the level of β-carotene in feed and on the breed of cow. Reported by Prache et al. (2003), β-carotene content in pasture herbage collected between May and June fluctuated between 620–720 mg·kg–1 of DM, and was significantly reduced in late August to 430 mg kg–1 DM. In the BL the lowest content of fat-soluble vitamins in milk were observed. At the same time, the BHBA concentration increased, which may confirm energy demand for fast growing milk yield in the first lacta- Influence of lactation stage on selected blood parameters and biological value of cow milk... 101 TABLE 4. Changes in analyzed components of milk and blood during different stages of lactation Stage of lactation Item Lactoferin (g·l ) –1 BL (5–30 days post partum) PL (60–90 days post partum) FL (120–150 days post partum) EL (250 days post partum) LSM1 (SE2) LSM (SE) LSM (SE) LSM (SE) 0.283 (0.001) 0.147 (0.001) 0.158 (0.001) 0.330 (0.001) Vitamin E (μg·dm–3) 1339.7 (15.668) β-carotene (μg·dm–3) 349.95 (5.365) 598.5 (7.658) 701.6 (6.568) 483.3 (6.547) BHBA (mmol·dm–3 ) 0.613A (0.045) 0.420A (0.025) 0.440A (0.034) 0.421A (0.029) AST (U·dm–3 ) 51.75A (5.895) 49.1B (6.346) 57.25AB (4.985) 56.75AB (5.678) ALT (U·dm ) 14.05 (0.345) 20.2 (0.457) 22.15 (0.587) 22.25A (0.398) NEFA (g·0.1 kg of milk fat–1) 0.475A (0.004) 0.580b (0.003) 0.845Ab (0.007) 0.912Ab (0.008) –3 A 1954.1 (19.896) 28774.7 (25.357) 2411.4 (22.158) A A SEM – standard error of the mean; 2 LSM – least square of mean; values in the same row marked with the same letters differ significantly AA, BB at P ≤ 0.01; aa, bb at P ≤ 0.05. 1 tion phase (Table 4). The highest level of β-carotene in milk was achieved in the EL (701.6 μg·dm–3). The highest vitamins E and A level was observed in the FL, where energy could be used for synthesis of the antioxidants. Dairy cattle consuming stored forages are often low in vitamin E, and vitamin E deficiencies are frequently observed during the periparturient period. Vitamin E can quench peroxidation reactions in cell membranes and is probably the most important antioxidant located in membranes (Putnam and Comben 1987). In cows near calving, Paterson (1965) reported a positive relationship between NEFA and the carotenoid content of plasma, suggesting the ability of bovine adipose tissue to release β-carotene. β-hydroxybutyrate acid (BHBA), along with acetone and acetoacetate, is considered a ketone. Ketones are produced during the metabolism of non esterified fatty acids (NEFAs) and volatile fatty acids. BHBA values above 27 mg·dl–1 are considered compatible with clinical ketosis. Cows with underlying hepatic lipidosis may have concurrent elevations in liver leakage enzymes: AST or cholestatic enzymes ALP. The level of BHBA concentration in blood is an indicator of a positive or negative energy balance in the cow. Additionally, cows with BHB values above or equal to 12.5 mg·dl–1 (1200 μmol·l–1) were eight times more likely to experience a left-displaced abomasum. The highest level of BHBA was observed in BL – 0.615 mmol·dm–3 (Table 4). Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) are important catabolic enzymes, which play an important role in the liver function of animals. Alanine aminotransferase activity in cows differs during certain production periods. The lowest ALT activity was measured during BL, while activity increased in the PL, FL, EL (Table 4). The aspartate aminotransferase activity changes irregularly during lactation. NEFA concentration reflects 102 T. Sakowski et al. the mobilization of lipid reserves to compensate for the imbalance between nutrients consumed by the cow and nutrients secreted in milk. Serum NEFA greater than 0.4 mEq·l–1 has been proposed to identify excessive prepartum NEB. NEFA concentrations were relatively low because energy balance becomes positive and cows replete the mobilized tissue reserves. The highest concentration was found in the EL (22.5 U·dm–3) and the lowest in the BL (Table 4). NEFA respond much quicker than BHBA to homeostasis changes. The emergence of an energy deficit results in a rapid increase of blood NEFA, and its rapid decline. Blood levels of NEFA usually show a strong variation related primarily to time of feeding. Radloff et al. (1966) noted that plasma NEFA levels decreased at 4 to 6 h after feeding while blood ketones increased. CONCLUSION Stage of lactation had a significant effect on the most analyzed milk constituents including: whey proteins, fat soluble vitamins, phospholipids. The study has shown a significant influence of lactation stage on the biological value of organic milk obtained from high producing dairy cows during pasture season. In addition, there is evidence that the organic intensity of the production system has no influence on the metabolic profile of high yielded cow’s as the plasma parameters were in norm. Acknowledgement Research was realized within the project POIG.01.01.02-014-090/09, entitled “BIOFOOD – innovative, functional products of animal origin”, co-financed by the European Union from the European Regional Development Fund within the Innovative Economy Operational Programme 2007–2013. REFERENCES AOAC, 1990: Official Methods of Analysis (15th ed.), Vol. 1. Association of Official Analytical Chemists, Arlington, VA. AULDIST M.J., WALSH B.J., THOMSON N.A., 1998: Seasonal and lactation influences on bovine milk composition in New Zealand. J. Dairy Res. 65 (3): 401–411. 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Streszczenie: Wpływ stadium laktacji wysokowydajnych krów rasy PHF na kształtowanie się parametrów profilu metabolicznego krwi oraz bioaktywnych składników ich mleka w trakcie sezonu pastwiskowego w ekologicznym systemie produkcji. Dysproporcja między zapotrzebowaniem bytowym krów a możliwością jego pokrycia powoduje obciążenie metaboliczne organizmu. W przypadku krów mlecznych główną przyczyną obciążenia metabolicznego jest brak równowagi między genetycznie uwarunkowanym potencjałem dużej produkcji mlecznej a ograniczonymi możliwościami pokrycia potrzeb pokarmowych energią zawartą w pobranych paszach. Skutkuje to ujemnym bilansem energii i nadmierną mobilizacją tłuszczu z rezerw organizmu, jak również zmianą w koncentracji bioaktywnych składników frakcji białkowej oraz frakcji tłuszczowej. Celem pracy było określenie wpływu stadium laktacji na kształtowanie się podstawowego składu chemicznego mleka oraz profilu metabolicznego wysokowydajnych krów w ekstensywnym systemie żywienia. Badaniami objęto 68 krów rasy polskiej holsztyńsko-fryzyjskiej (pierwiastki). W trakcie realizacji doświadczenia pobrano 272 próbki mleka od krów, które znajdowały się w jednym z następujących stadiów laktacji: 5.–30. dzień laktacji (BL); 60.–90. dzień laktacji (szczyt laktacji; PL); 120.–150. dzień laktacji; powyżej 250. dnia laktacji (EL). Badania wykazały, że faza laktacji w istotny sposób kształtowała koncentrację laktoferyny, witaminy E oraz β-karotenu w mleku krów w trakcie sezonu pastwiskowego. Najwyższą koncentrację laktoferyny wykazano w początkowym okresie laktacji (BL), podobną zależność wykazano w przypadku kwasu β-hydroksymasłowego (BHBA). Największą aktywność aminotransferazy alaninowej i wolnych kwasów tłuszczowych wykazano w końcowej fazie laktacji (EL). Wyniki 104 T. Sakowski et al. badań potwierdzają, że również w przypadku systemu ekstensywnego wzrost wydajności jest ściśle związany ze wzrostem zapotrzebowania krów na energię. Uzyskane wartości dla wskaźników profilu metabolicznego uzyskane dla czterech faz laktacji znajdowały się na niższym poziomie względem wartości uzyskiwanych przez krowy w intensywnym systemie produkcji. Dowodzi to, że stosowanie systemu ekologicznego gwarantuje zarówno lepszy pod względem wartości biologicznej produkt finalny, jak i zdrowe zwierzę (bez zaburzeń metabolicznych). MS received May 2015 Authors’ address: Tomasz Sakowski Zakład Doskonalenia Zwierząt Instytut Genetyki i Hodowli Zwierząt PAN ul. Postępu 1, 05-552 Jastrzębiec Wólka Kosowska, Poland e-mail: [email protected] Annals of Warsaw University of Life Sciences – SGGW Animal Science No 54 (1), 2015: 105–113 (Ann. Warsaw Univ. of Life Sci. – SGGW, Anim. Sci. 54 (1), 2015) Differences in the assessment of beef carcasses in EUROP system KAROLINA WNĘK1, MARCIN GOŁĘBIEWSKI1, TOMASZ PRZYSUCHA1, ALICJA WOŹNIAK², JERZY WIERZBICKI2 Department of Animal Breeding and Production, Warsaw University of Life Sciences – SGGW Polish Association of Beef Cattle Producers 1 2 Abstract: Differences in the assessment of beef carcasses in EUROP system. Classification of slaughter animals in EUROP system is obligatory for all EU countries. Visual assessment of beef carcasses determines the level of muscle and fat in scales from E to P and from 1 to 5. At the same time beef carcass is classified into one of five categories of cattle for slaughter from A to E. Visual assessment is not fully objective and is fraught with classifier error, which has an impact on the final assessment of the carcass. 2689 beef carcasses were classified in different categories for slaughter. Assessments were performed by three classifiers independently and in the same conditions in the slaughter line. Based on the results of evaluations of beef carcasses were performed statistical analysis. The average value for the conformation was class O, which accounted for 52.66% of all beef carcasses and at a comparable level fat classes 2 and 3 – 39.54, 32.54% respectively, which is characterized by a low content of meat and average fat content in carcase. CV (coefficient of variation) for the SE (standard deviation) in the conformation class was around 3% for the three categories slaughter A, B and E, and D was 2.16%. For the fat class regardless of the category slaughter CV for the SE was three times larger. The results suggest that visual assessment of beef carcasses is not objective and is fraught with error evaluator. INTRODUCTION Introduced in 1981, EUROP grid is currently the most popular in the European Union grading system, which allows for visual determination of conformation and fatness of the carcass. The primary purpose of the EUROP is sort carcasses according to their value for further processing and to ensure fair payment to beef producers. Additionally, EUROP method was developed by countries trading within the common EU market to uniform principles and criteria of beef carcasses assessment. The conformation score ranges from S (superior), used to describe rare double-muscled carcasses, via E (excellent) through to P (poor) and from 1 (low) to 5 (high) for fat cover. Each conformation and fat class is subdivided into low medium and high classes marked as “+” for high, “without indication” for medium and “–” for low, respectively (Commission Regulation 1249/2008). According to the Polish regulation, all large plants that slaughter over 75 head of cattle and over 200 pigs a week on average during the entire year are Key words: beef carcass, classification, EUROP obligated to introduce EUROP carcass system, conformation, fat class classification system (Pawelec 2010). 106 K. Wnęk et al. The carcasses are visually evaluated by adequately trained person who has a valid license (Choroszy and Choroszy 2011). The main disadvantage of carcass evaluation by classifiers is subjective assessment of the carcass, which makes this system not fully accurate and objective. Moreover, it is essential for performance recording that the measured phenotype reflects the true genetic value for the animal with minimal variation arising from the assessment method. In response to these issues, there has been a drive to move away from visual classification. The modern assessment systems of carcass grading do not take into account the small differences in the quality of the carcass, which often are the result of breeding improvement directed to improve the cattle conformation (Cegiełka 2013, Wnęk et al. 2014a). Sometimes, the determined by classifier values of the carcass is far away from its true value. The aim of the study was to determine the differences in beef carcasses evaluation with the EUROP grid by independent classifiers. MATERIAL AND METHODS The material for the analysis consisted of 2689 beef carcasses (breed Polish Holstein-Friesian) classified according to EUROP guidelines contained in the Commission Regulation No 1249/2008, including: – 905 carcasses belonged to A slaughter category (carcasses of castrated males aged from 12 to 24 months); − 427 carcasses belonged to B slaughter category (carcasses of castrated males animal aged above 24 months); − 856 carcasses belonged to D slaughter category (carcasses of cows); − 501 carcasses belonged to E slaughter category (carcasses of other male animal aged above 12 months). Slaughter and classification were held in a slaughterhouse ECO-BEEF at Węgrzynów. Each carcass was classified by three professional classifiers with valid certificate. Carcass evaluation was processed independently and under the same conditions (including lightening) in slaughterhouses. The carcasses were arranged in random order for each repetition. The unified 5-grade scale of carcass assessment involving fat and conformation evaluation, which has been used by the classifiers is shown in Table 1. The results of the carcasses classification were written on sheets of paper, and then MS Excel database was created. For each of the EUROP grades and slaughter categories coding system presented in Tables 2 and 3 was applied. TABLE 1. Description of the EUROP conformation and fat evaluation system Conformation class Carcase quality Fat class Fat cover E excellent 1 low U very good 2 slight R good 3 average O fair 4 high P poor 5 very high Presented average x– describes the arithmetic average of three independent classifications. The experimental data were evaluated by running ANOVA on IBM SPSS 21 (Statistical Product and Service Solution) according to following statistical model Differences in the assessment of beef carcasses in EUROP system 107 TABLE 2. Coding system of conformation and fat class of beef carcasses Conformation Numerical value Conformation Numerical value Conformation Numerical value Conformation Numerical value Conformation Numerical value E 1 U 2 R 3 O 4 P 5 E= 1.75 U= 2.75 R= 3.75 O= 4.75 P= 5.75 E– 1.5 U– 2.5 R– 3.5 O– 4.5 P– 5.5 E+ 1.25 U+ 2.25 R+ 3.25 O+ 4.25 P+ 5.25 Fat class Numerical value Fat class Numerical value Fat class Numerical value Fat class Numerical value Fat class Numerical value 1 1 2 2 3 3 4 4 5 5 1= 1.75 2= 2.75 3= 3.75 4= 4.75 5= 5.75 1– 1.5 2– 2.5 3– 3.5 4– 4.5 5– 5.5 1+ 1.25 2+ 2.25 3+ 3.25 4+ 4.25 5+ 5.25 TABLE 3. Coding system of categories slaughter beef carcass Categories slaughter Numerical value A – carcasses of castrated male animal aged from 12 to less than 24 months 1 B – carcasses of castrated male animal aged above 24 months 2 D – carcasses of female animal that has calved 3 E – carcasses of other male animal aged above 12 months 4 Yij = μ + Ai + ej where: Yij – dependent variable; μ – overall mean; Ai – effect of slaughter category (i = = 1–4, Table 3); ej – residual error. Any significant differences were present among the means at a 95.0% confidence level. The analysis of distribution of EUROP grading differences was performed by non-parametric chi-square test. RESULTS AND DISCUSSION The results of conformation and fatness grading are presented in Table 4. The most frequent assessment of the confor- mation was the class O and in the 2 and 3 in fatness (independently of age or sex). Figures 1 and 2 show the percentage of carcasses in the various categories of conformation and fatness. The largest share of the carcasses were in the O – 52.66% (for conformation) and categories 2 and 3 – 39.57 and 32.54% (for fatness) respectively. These carcasses were characterized by low quantity of meat and average fat content (Guzek et al. 2013). Beef production in Poland TABLE 4. Statistical parameters of evaluations for carcasses fatness and conformation Factor x– x– conformation x– fatness 4.58 3.07 Me 4.67 2.92 D0 4.75 2.75 SE 0.735 0.962 108 K. Wnęk et al. E. 0.1% U. 2.16% 5. 2.34% 1. 10.75% P. 27.3% R. 17.78% 4. 14.8% O. 52.66% 3. 32.54% 2. 39.57% FIGURE 1. Percentage of carcasses in the various conformation categories FIGURE 2. Percentage share of carcasses in the various categories of fatness is mostly based on dairy breeds (Pilarczyk and Wójcik 2007, Litwińczuk and Grodzki 2014). Contribution of breeding beef cattle to animal production is minimal – currently less than 1% of the whole cattle population. Black-and-White cattle crossed with Holstein-Friesians were the basic breed – over 85% in the structure of beef production in Poland (Węglarz 2010). Consequently, in Polish grading system, dominates class “O” – which consists more than 60% of all classified carcasses (Seredyn 2006). Therefore, our beef producers do not have a strong argument in prices negotiations. Table 5 presents the correlation coefficients between the fatness and conformation evaluations. The objective assessment depends on human judgment, which can be subjective, and inconsistent (Allen and Finnerty 2000, Wnęk et al. 2014b). Differences in the assessment of fat classes were more frequent than for the carcass conformation (P ≤ 0.05). Carcass evaluation affects its economic value and therefore precision and repeatability of carcass grading is necessary. TABLE 5. The correlation coefficients between the evaluations carcass fatness and conformation Fatness x– Conformation x– SE Me –0.28 1.5** –0.24 SE –1.94** 0.32 –1.92* Me –0.34 –0.07 –0.31 * significance at P ≤ 0.05; **significance at P ≤ 0.01. Figures 3, 4, 5 and 6 present the percentage of carcasses according to the slaughter category and carcass conformation. For conformation class E only three carcasses were classified and the rest were classified in slaughter category A. In the class P the majority were carcasses in slaughter category D – carcasses of adult female, characterized by low dressing percentage. Figure 7, 8, 9, 10 and 11 present the percentage of carcasses according to the slaughter category and fat classes. In the slaughter category D was the majority were carcasses with high fatness. Dairy cows are of poorer quality livestock (Rycombel 2004). Differences in the assessment of beef carcasses in EUROP system 109 A. 51.72% A. 48.22% B. 18.97% B. 22.64% D. 13.79% D. 8.39% E. 15.52% E. 20.75% FIGURE 3. The percentage of the carcasses in the conformation U FIGURE 4. The percentage of the carcasses in the conformation R A. 36.95% A. 16.1% B. 17.41% B. 8.32% D. 23.61% D. 64.53% E. 22% E. 11.05% FIGURE 5. The percentage of the carcasses in the conformation O FIGURE 6. The percentage of the carcasses in the conformation P A. 20.07% A. 42.28% B. 13.15% B. 21.56% D. 60.9% D. 24.77% E. 5.88% E. 11.39% FIGURE 7. The percentage of the carcasses in the fatness 1 FIGURE 8. The percentage of the carcasses in the fatness 2 110 K. Wnęk et al. A. 39.12% A. 13.45% B. 14.28% B. 8.38% D. 25.28% D. 39.85% E. 21.32% E. 38.32% FIGURE 9. The percentage of the carcasses in the fatness 3 FIGURE 10. The percentage of the carcasses in the fatness 4 A 0.00% B. 1.6% D. 59.68% E. 38.72% FIGURE 11. The percentage of the carcasses in the fatness 5 Conformation and fatness grades largely depends on the age and sex of animals for slaughter (Raesa et al. 2003, Bureš et al. 2006, Mach et al. 2008). Tables 6 and 7 presents an effect of slaughter category on the results of EUROP evaluation for conformation and fatness. In category slaughter 3 – D – carcasses of cows, average grade was 5.03 which was an equivalent of P class, characterized by the lowest level of conformation (Pawelec 2010). The CV for the SE is more than three times higher in fat assessments in relation to muscle assessments independently of slaughter category. Also, SE was higher in fat classes than conformation class, irrespective of slaughter category. Fat can be deposited not only in the subcutaneous tissue, but also between muscle fibers– –intramuscular fat and carcass evaluation is based on the profiles of the carcass. Therefore, such an assessment is usually TABLE 6. Effect of slaughter category on the results of assessments for conformation Categories slaughter x– N 1 x– SE N 2 x– SE N 3 x– SE N 4 x– SE 905 4.33 0.231 427 4.36 0.327 856 5.03 0.218 501 4.45 0.292 SE 905 0.14 0.064 427 0.12 0.117 856 0.1 0.059 501 0.14 0.009 Me 905 4.33 0.237 427 4.37 0.337 856 5.04 0.224 501 4.47 0.298 CV (%) 905 3.38 0.157 427 3.03 0.3 856 2.16 0.125 501 3.41 0.221 Factor Differences in the assessment of beef carcasses in EUROP system 111 TABLE 7. Effect of slaughter category on the results of assessments for fatness Categories slaughter Factor x– N x– 905 SE Me 1 SE N x– 2.92 0.713 427 905 0.26 0.301 905 2.95 0.757 CV (%) 905 9.7 2 SE N x– 2.87 0.788 856 427 0.23 0.286 427 2.87 0.822 11.933 427 8.82 3 4 SE N x– 3.04 1.155 501 3.58 0.951 856 0.21 0.282 501 0.25 0.314 856 3.07 1.167 501 3.61 0.978 11.557 856 7.81 11.051 501 7.59 10.085 SE fraught with some error. Lack of precision and accuracy in the classification of carcasses can be also caused by classifier fatigue, abnormal color of fat, or/and fat thickness that accompanies with high percentage of muscle tissue (Craigie et al. 2012, Cegiełka 2013). grading on the basis of properties and market requirements, depending on software and system calibration (Craigie et al. 2012). In practice, a visual assessment of the EUROP system performs only one person, so it is not fully representative. CONCLUSIONS This research was supported by the project, entitled “Optymalizacja produkcji wołowiny w Polsce, zgodnie ze strategią »od widelca do zagrody«” (“Optimizing of beef production in Poland according to »from fork to farm strategy«”), co-financed by the European Regional Development Fund under the Innovative Economy Operational Programme (Contract UDA-POIG.01.03.01-00-204/09-08) – Task 2a. Improving the competitiveness and profitability of Polish beef production requires an increase in the supply of good beef quality livestock, mainly terminal crossbreeds (Jasiorowski 2003, Seredyn 2006). An important factor in the beef cattle herds is selection of appropriate breed, which should be dependent on production system, nutrition and knowledge of the breeder (Przysucha et al. 2007). Crossbreeding dairy breeds with beef breeds is the most suitable method for improving beef livestock quality (Węglarz 1997, Trela et al. 2002, Voříšková et al. 2002, Bartoń et al. 2005). An important factor in the growth of consumer satisfaction, as well as the supply of beef would be to improve the precision and accuracy of the evaluation beef carcasses and automated technologies of objective grading systems offers such opportunity. The objective grading system has the ability to accurate carcass Acknowledgements REFERENCES ALLEN P., FINNERTY N., 2000: Objective beef carcass classification. 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VOŘÍŠKOVÁ J., FRELICH J., ŘÍHA J., ŠUBRT J., 2002: Relationships between parameters of meat performance in Czech Pied bulls and their crossbreds with beef. Czech J. Anim. Sci. 47 (9): 357–364. Streszczenie: Różnice w ocenie tusz wołowych w systemie EUROP. Klasyfikacja tusz zwierząt rzeźnych w systemie EUROP jest obowiązkowa dla wszystkich państw UE. Wizualna ocena tusz wołowych określa poziom umięśnienia oraz otłuszczenia w pięciostopniowych skalach od E do P i od 1 do 5. Jednocześnie każda tusza wołowa klasyfikowana jest do jednej z pięciu kategorii bydła rzeźnego od A do E. Niestety wizualna Differences in the assessment of beef carcasses in EUROP system ocena nie jest w pełni obiektywna i jest obarczona błędem oceniającego, co ma wpływ na ostateczną ocenę tuszy. Sklasyfikowano 2689 tusz wołowych w różnych kategoriach rzeźnych. Ocen dokonywało trzech klasyfikatorów niezależnie od siebie i w tych samych warunkach panujących na linii ubojowej. Na podstawie uzyskanych ocen dokonano analizy statystycznej. Najczęściej występującą klasą umięśnienia była klasa O, co stanowiło 52,66% wszystkich sklasyfikowanych tusz. W klasie otłuszczenia były to na porównywalnym poziomie dwie klasy: 2 i 3 – 39,57 i 32,54%, co charakteryzuje tusze o małej zawartości mięsa i średniej zawartości tłuszczu. CV dla SE wynosił dla klasy umięśnienia około 3% dla trzech kategorii rzeźnych: A, B i E, a dla D wynosił 2,16%. Dla klasy otłuszczenia niezależnie od kategorii rzeź- 113 nej CV w przypadku SE był trzy razy większy. Otrzymane wyniki sugerują, że wizualna ocena tusz wołowych nie jest obiektywna i jest obarczona błędem oceniającego. MS received May 2015 Authors’ address: Karolina Wnęk Zakład Hodowli Bydła Katedra Szczegółowej Hodowli Zwierząt Wydział Nauk o Zwierzętach SGGW ul. 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