The effects of systematic factors on milk yield in Simmental cows over complete lactations
2009
Petrovic, M.D., Faculty of Agronomy, Cacak (Serbia) | Skalicki, Z., Faculty of Agriculture, Belgrade - Zemun (Serbia) | Petrovic, M.M., Institute for Animal Husbandry, Belgrade - Zemun (Serbia) | Bogdanovic, V., Faculty of Agriculture, Belgrade - Zemun (Serbia)
The effect of systematic factors on production traits over complete lactations was investigated in 2,805 Simmental cows born in 1982 and onwards. The cows were housed at three farms in different areas in Serbia. The systematic factors (farm, calving season, lactation group, group (year x season of birth), farm x calving season, and farm x lactation group interactions) and age at the first conception had statistically highly significant effects on all complete lactation traits, with the exception of the effect of calving season on complete lactation duration and milk fat content. No statistically significant effect was produced by age at the first conception on complete lactation duration and milk fat content. Determination coefficients ranged from 0.100 in complete lactation duration to 0.361 in milk-fat content.
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