Features of Holstein Cattle Bred in Kazakhstan by the Polymorphic Genes of the Somatotropin Cascade

Abstract

The article presents the results of studying the genetic structure by bGH-AluI and bIGF-1-SnaBI polymorphisms in Holstein cows bred in Kazakhstan. It has been shown that bGH and bIGF-1 genes in the Kazakh population of Holstein cows are polymorphic. By the growth hormone gene, the frequency of bGH-AluIL allele is 0.82; of bGH-AluIV allele – 0.18; by the gene of the insulin-like growth factor-1, the frequency of bIGF-1-SnaBIA allele is 0.58; and of bIGF-1-SnaBIB allele – 0.42. By all the studied polymorphic loci, the Kazakhstan population of Holstein cows is in the state of Hardy-Weinberg genetic equilibrium. The authors believe that research should be continued and the effect of genotypes of bGH-AluI and bIGF-1-SnaBI polymorphisms on milk production should be determined.