Abstract
The influence of genotypic factors on the level of milk productivity of cows in the herd of the State Enterprise "Experimental base "Sveklovichnaya" has been studied. The herd is characterized by a high degree of Holsteinization. With an increase in the proportion of the genotype for the Holstein breed, an increase in milk yield is observed in animals. The highest milk yield was found in the cows of the Dutch selection (6604.2 kg), the protein content was in the milk of the cows of the Belarusian selection (3.52%). The cows of the P. I. Star line (6941.5 kg and 3.56%, respectively) are characterized by the highest milk yield and protein content, the cows of the Melwood line showed the minimum milk yield - 5427.1 kg and the highest fat content in milk - 4.0%.
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