Evaluation of milk productivity for Tatarstan-type cows with different complex genotypes by lipid metabolism genes

The aim of the research was to study the effect on dairy productivity of cows of a complex genotype by the loci of lipid metabolism genes, namely: Low-density lipoprotein receptor ( OLR1 ), Diacylglycerol-O-acyltransferase ( DGAT1 ) and Leptin ( LEP ). The research was carried out in the conditions of the agricultural company "Agrofirma Rassvet" of the Kukmorsky district of the Republic of Tatarstan on the livestock of 79 cows of the Tatarstan type. As a result of molecular genetic research (PCR-RFLP and AS-PCR), the animal population was sorted into groups, taking into account the complex genotype by the loci of the OLR1, DGAT1 and LEP genes. The highest indicators of milk productivity (milk yield, amount of milk fat and protein) were found in Tatarstan-type cows with complex genotypes of lipid metabolism genes ( OLR1, DGAT1, LEP ), three complex genotypes AC/AA/CC , AC/AA/CT and AC/AK/CC differed. An assessment of the influence of the complex genotype by the loci of the OLR1, DGAT1 and LEP genes of the first heifers on milk productivity indicators is proposed, thanks to which it is possible to increase the volume of high-quality dairy raw materials necessary to increase the efficiency of cattle breeding.