The effect of age at first insemination on reproductive, productive, longevity and lifetime production traits in Simmental cows | Uticaj uzrasta pri prvoj oplodnji na reproduktivne, proizvodne i funkcionalne osobine krava Simentalske rase
2008
Petrovic, M., Agronomski fakultet, Cacak (Serbia) | Bogdanovic, V., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Bogosavljevic-Boskovic, S., Agronomski fakultet, Cacak (Serbia) | Djokovic, R., Agronomski fakultet, Cacak (Serbia)
The calculated linear regression coefficients suggested that the age at the first insemination had a statistically significant effect on milk, milk fat and 4% fat milk production in whole lactations, a very high significant effect on the age at culling and cow utilization index, and no significant effect on other longevity traits. The age of cows at the first insemination did not significantly affect fertility and lifetime milk and milk fat production traits. The p[resented results suggest that cow age at the first insemination should be included in the models used in estimating breeding values of dairy cows.
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