Polymorphism of growth hormone and prolactin genes in connection with milk quality determinants in cattle of the Yaroslavskaya breed

The authors investigated the dependence between milk productivity of cattle of the Yaroslavskaya breed and bGH and bPRL genes of growth hormone and prolactin, respectively, in Alu1 and Rsa1 restriction sites. The complex genotypes of these genes were established, which determined more high and low percentage of milk fat and protein. The obtained principles can be used for revelation of animals, having prospects in relation to milk productivity at the early detection of the applicant to pedigree or commercial stock.