FACTORS AFFECTING THE DAIRY PRODUCTIVITY OF COWS
The analysis of the milk yield level depending on the genotype of cows showed that the II generation crossbreeds have higher milk productivity, but the observed difference is not statistically significant. Dairy productivity in cows changes significantly with age. In the group of cows of the black-and-white breed of the IV generation, the growth compared to the first lactation was 6.5 to 2 and 3.9 % to 3 lactation, in cows of the III generation 10.2 and 9.7, in cows of the II generation 8.9 and 9.1 %, respectively.