ANALYSIS OF CHANGES IN PROTEIN MILK PRODUCTION UNDER THE INFLUENCE OF INDIRECT BREEDING
Studies have shown that one should not expect an increase in the protein content in milk of cows when breeding only for milk yield and fat content. The obtained results of the model selection of mothers for the protein content in milk can be explained by the manifestation of the biological law of the return of the trait to the average value for the herd, which is facilitated by the lack of selection for this trait. However, the carried out model selection of animals obtained from reproductive crossing according to the fat content in milk showed that during selection there is a certain return of the trait to the average. From cows-mothers with different protein content in milk, daughters were obtained with the same protein content. In the group of animals, the opposite tendency was outlined from absorptive crossing - the best daughters in terms of milk protein were obtained from the worst mothers.