THE INFLUENCE OF FEMALE ANCESTORS ON MILK PERFORMANCE IN FIRST- CALF COWS OF THE HOLSTEIN BREED DAIRY CATTLE OF DOMESTIC SELECTION

Abstract

The results of studies on the influence of female ancestors on the milk performance in first-calf cows of the Holstein breed of dairy cattle of domestic selection are presented. The highest values of milk yield, the amount of milk fat and protein, as well as the mass fraction of protein in milk were observed in daughters whose mothers’ milk yield was over 10,000 kg and amounted to 9295 (p≤0.01), 341.3, 313.3 (p≤0.01) kg, 3.37% (p≤0.05), respectively. First-calf cows with a milk yield of MM 9001-9500–9227 kg (p≤0.001) have a high degree of abundant milk production. They also had the highest amount of milk fat and protein, which amounted to 344.8 (p≤0.01) and 309.4 (p≤0.001) kg, respectively. The highest milk yield, milk fat and protein content were in first-calf cows with a milk yield of MF over 14.000 kg. The realization of the genetic potential for milk yield over 305 days of lactation was 102.1%.