Protein metabolism genes and milk quality indicators of Jersey breed cows owned by PMK LLC, Sabinsky District, Republic of Tatarstan

The genetic potential of animals is determined by a complex of hereditary genes, and, based on this, DNA assessment is important in the selection of animals for breeding. One of the methods of early assessment is the prediction of the breeding value of animals using DNA technologies. Research has shown that the factors of productivity of farm animals include not only the conditions of maintenance and the quality of feeding, but also the genetic potential of individuals. The genotype plays an important role in the formation of breeding qualities of animals, and these qualities depend on inherited genetic complexes. During the analysis of the productivity of Jersey cows in the "PMK" of the Sabinsky district of the Republic of Tatarstan, it was found that animals with the complex genotype CSN3bbBLGbb had the highest protein milk yield - 3.79 %, the mass fraction of protein - 255.76 kg. Such cows are 18.1 %. The accumulation of animals with the complex genotype CSN3bbBLGbb in herds will lead to an increase in not only the milk productivity of animals, but also to an increase in the production of high-quality protein milk products. In the future, this will increase the level of profitability of milk production, improve the competitiveness of products in the domestic and global food markets, increase the efficiency of industry development, and help in the formation of the country's national food security system.