Phenotypic correlations of productive and reproductive traits of Simmental cows | Fenotipske korelacije proizvodnih i reproduktivnih osobina krava Simentalske rase
Pantelic, V., Institut za stocarstvo, Beograd - Zemun (Serbia) | Skalicki, Z., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Petrovic, M.M., Institut za stocarstvo, Beograd - Zemun (Serbia) | Aleksic, S., Institut za stocarstvo, Beograd - Zemun (Serbia) | Miscevic, B., Fakultet za biofarming, Sombor (Serbia) | Ostojic-Andric, D., Institut za stocarstvo, Beograd - Zemun (Serbia)
Research included 3.461 first calving Simmental cows in control, with lactations concluded within one year. All first calving cows were reared by private/individual farmers on the territory of the Republic of Serbia. Phenotypic correlations between following milk and fertility traits have been investigated: duration of lactation, milk yield, milk fat content, milk fat yield, yield of 4% FCM, age at the first calving and duration of service period. Results of investigation of phenotypic correlations are obtained using mixed models LSMLMW (Harvey 1990). This method enables optimal consideration of numerous effects on investigated traits (bull sires, region, calving season, and calving year). Phenotypic correlation of traits in cattle breeding relates to presence of mutual positive and negative covariance which is result of the effect of genetic and factors of environment. Information of phenotypic correlations between milk and fertility traits can be of great importance in selection of cows, since it provides possibility to choose/select heads on the several traits at the same time.
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