TY JOUR TI PHENOTYPIC EFFECTS OF SOMATOTROPONOGO CASCADE GENES ASSOCIATED WITH BEEF PRODUCTIVITY OF KAZAKH WHITE-HEADED BREED COWS KW genes KW cascade KW polymorphism KW productivity KW breed KW somatotropic KW beef JO Bulletin Samara State Agricultural Academy AU Beishova, I.S. PY 2018 IS 3 PB Samara State Agrarian University