Milk productivity and milk quality of Tatarstan-type cows with different genotypes according to the loci for prolactin and somatotropin genes

As numerous studies of scientists show, the genotype for prolactin (PRL) and somatotropin (GH) genes of cows affects the milk productivity and the quality of their milk. In this regard, the purpose of this study was to study the milk productivity and qualitative composition of milk in Tatarstan-type cows with different genotypes of prolactin and somatotropin in the conditions of the Republic of Tatarstan. The analysis of the milk productivity of the first heifers of the Tatarstan type with different genotypes according to the loci of the prolactin and somatotropin genes showed that the highest indicators for milk yield, the amount of milk fat and protein had the genotypes PRL/AA, GH/LL and GH/LV compared with analogues of other genotypes.