Abstract
This article discusses the issues of increasing the milk productivity of cows. Research on Simmental cows was carried out using a group method on farms in the North Kazakhstan region. 2 groups of cows of 17 heads each were formed. Animals in groups were selected taking into account age, health status, number of lactations, level of productivity during the previous lactation, calving time, and live weight. The cows of the control group were fed the general diet + wheat bran in the amount of 5 kg, the experimental group was fed the same diet as in the control group, but part of the wheat bran was replaced with 1,5 kg of sunflower meal. Enriching the diet with protein made it possible to increase the average annual milk yield in the second group by 395 kg, or 7% at P>0,99. There was a slight increase in milk fat and protein in the experimental group. The amount of milk fat in the second group significantly exceeded the control group by 17 kg (P>0,99), or 8% superiority was also observed in the milk protein content; a significant difference between the groups was 15 kg in favor of the experienced cows.