TY JOUR TI CHARACTERISTIC OF MILK PRODUCTIVITY OF COWS-HEIFERS WITH DIFFERENT GENOTYPES OF SOMATOTROPIN (GH) KW genotype KW somatotropin KW growth hormone KW GH KW polymorphism KW PCR-RFLP KW cattle KW milk yield KW fat KW protein JO Vestnik of Kazan State Agrarian University AU Safina, N.Y. AU Gilemhanov, I.Y. AU Zinnatova, F.F. AU Shakirov, S.K. PY 2019 IS 14 PB Kazan state agrarian University