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Original scientific paper

Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds

Zdenko Ivkić ; Croatian Agricultural Agency, Ilica 101, 10000 Zagreb, Croatia
Marija Špehar
Vesna Bulić
Pero Mijić
Ante Ivanković
Drago Solić

Fulltext: english, pdf (644 KB) pages 143-150 downloads: 520* cite
APA 6th Edition
Ivkić, Z., Špehar, M., Bulić, V., Mijić, P., Ivanković, A. & Solić, D. (2012). Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds. Mljekarstvo, 62 (2), 143-150. Retrieved from https://hrcak.srce.hr/83364
MLA 8th Edition
Ivkić, Zdenko, et al. "Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds." Mljekarstvo, vol. 62, no. 2, 2012, pp. 143-150. https://hrcak.srce.hr/83364. Accessed 22 Jun. 2021.
Chicago 17th Edition
Ivkić, Zdenko, Marija Špehar, Vesna Bulić, Pero Mijić, Ante Ivanković and Drago Solić. "Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds." Mljekarstvo 62, no. 2 (2012): 143-150. https://hrcak.srce.hr/83364
Harvard
Ivkić, Z., et al. (2012). 'Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds', Mljekarstvo, 62(2), pp. 143-150. Available at: https://hrcak.srce.hr/83364 (Accessed 22 June 2021)
Vancouver
Ivkić Z, Špehar M, Bulić V, Mijić P, Ivanković A, Solić D. Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds. Mljekarstvo [Internet]. 2012 [cited 2021 June 22];62(2):143-150. Available from: https://hrcak.srce.hr/83364
IEEE
Z. Ivkić, M. Špehar, V. Bulić, P. Mijić, A. Ivanković and D. Solić, "Estimation of genetic parameters and environmental effects on somatic cell count in Simmental and Holstein breeds", Mljekarstvo, vol.62, no. 2, pp. 143-150, 2012. [Online]. Available: https://hrcak.srce.hr/83364. [Accessed: 22 June 2021]

Abstracts
The objective of this study was to estimate genetic parameters and environmental effects on somatic cell count in Croatian dairy cows. Data consisted of 861,417 test-day records for Simmental and 656,272 for Holstein cows. For Simmental breed, number of animals in pedigree was 123,199, while pedigree file for Holstein breed included 94,294 animals. A single-trait repeatability fixed regression test-day model was used to estimate genetic parameters. Fixed effects in the model were parity and calving season. Days in milk was fitted using Ali-Schaeffer lactation curve nested within parity. Age at first calving was modelled as quadratic regression. Direct additive genetic effect, herd, herd-test-date, and permanent environmental effect of cow within parity were included in the model as random effects. Variance components were estimated using Residual Maximum Likelihood method as implemented in the VCE-6 program. Estimated heritabilities were 0.21 for Simmental and 0.15 for the Holstein breed. Permanent environmental effect explained 19 % of phenotypic variation in Simmental and 20 % in Holstein breed. Herd and herd-test-date accounted for another 9 % and 5 % of variability for Simmental breed. The effects of herd and herd-test-date explained 10 % and 5 % of phenotypic variance in Holstein breed.

Keywords
somatic cell count; Simmental and Holstein breed; environmental effects; genetic parameters

Hrčak ID: 83364

URI
https://hrcak.srce.hr/83364

[croatian]

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