Influence of complex genotypes of GH and PRL genes on milk productivity and milk quality of cows

Abstract

The aim of the study is to analyze the obtained data on the effect of complex genotypes of the somatotropin (GH) and prolactin (PRL) genes on the milk productivity of cows, on the amount and mass fraction of fat and protein in milk, that is, on the quality indicators of dairy raw materials. The study was conducted on a sampling consisting of 158 cows at first calving of Holsteinized black-and-white breed of pedigree breeding unit, “Dusym” LLC of the Atninsky district of the Republic of Tatarstan. As a result of molecular genetic studies (PCR-RFLP technique), the livestock was divided into groups taking into account the complex genotype of the GH / PRL hormone genes. The proposed evaluation of cows with different complex genotypes of the GH and PRL genes by animals selection and matching will further increase the amount of high-quality dairy raw materials.