INFLUENCE OF PRODUCTIVEPOTENTIALOF FEMALE ANCESTORS ON MILK PRODUCTIVITY INDICATORS IN FIRST-CALF COWS OF HOLSTEIN DAIRY CATTLE BREED OF DOMESTIC SELECTION

The article presents the results of the study on the influence of female ancestors on the milk productivity of first-calf cows of the Holstein dairy cattle breed of domestic selection. It was found that the highest milk productivity indicators were noted in the fathers’ mothers, whose milk yield, the amount of milk fat and protein isby 5265, 235.9 and 169.2 kg, respectively, more than in their mothers. The highest values of milk yield, the amount of milk fat and protein were noted in daughters, whose mothers' milk yield was 9001-9500 kg - 6736 (p ≤ 0.001), 254.2 (p≤0.05) and 233.9 (p≤0.05) kg, respectively. The implementation of genetic potential exceeded 100% by the mass fraction of protein by 4.6 percentage points, and the lowest indicators were for the amount of milk fat and milk yield (74.4 and 76.7%, respectively).