GENETIC EVALUATION OF SIMMENTAL SIRES FOR MILK YIELD AND LACTATION PERSISTENCY OF THE HEIFERS
In this study used field data from 728 Simmental heifers are daughters of 24 sires. Effect of sire for milk production and lactation persistency the daughters has been significant: F = 1,7-2,9 (P<0,05-0,001). Evaluation of breeding values of sires (by EBV) was performed by mixed linear regression model. The positive significant effect for lactation persistency (0,11-0,27 kg) estimated 47% of sires and for milk yield (117-465 kg) - 29%.