Characteristic of Milk Productivity of Cows-Heifers With Different Genotypes of Somatotropin (Gh)

Abstract

. Polymorphisms of genes may be useful as genetic markers for additional selection criteria in dairy cattle breeding for economically advantageous traits. The presented study is dedicated to the influence of gene polymorphism, responsible for milk quality and milk productivity was carried out among Holstein cow-heifers in Integrated Agricultural Production Centre “Stud farm named after Lenin” of Atninsky district of the Republic of Tatarstan. DNA samples were isolated from blood samples of 130 cows for genotyping according to gene of growth hormone (GH) by PCR-RFLP analysis method. The genotypes distribution of the somatotropin gene were as follows: LL – 63.8% (83 animals), LV – 30.0% (39 animals), VV – 6.2% (8 animals), the distribution in frequency of occurrence of alleles L - 0.788 and V - 0.212. When considering the gene polymorphism association with the signs of milk production and the qualitative composition of milk showed prominent results cow-heifers with a LL genotype. The identified relationships indicate the possible genetic improvement of the investigated herds using marker-assisted selection.