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The influence of genetic and paratypical factors on milk productivity has been studied for many years, but the influence of genotypes was considered as belonging to a genealogical line, which does not give correct results in terms of genetics, the influence of homo- and heterozygosity. The relevance of the work lies in the fact that for the first time a genome-wide study was carried out on the breeding stock of cattle in the Sverdlovsk region and the relationships between the influence of some genes and the paratype on milk productivity were established. In order to maximally reveal the influence of genotypes, farms with the same technological conditions, but giving a significant difference in milk productivity and quality, were selected. Analysis of complete genotypes by the method of principal components showed the genetic homogeneity of the sample, which forms a large general cluster, corresponding to the general trend of Holsteinization of black-and-white cattle. The influence of the environmental factor on productivity indicators turned out to be significant, with the exception of the proportion of protein in the third lactation, all of them were statistically significantly different P &lt;0.01. Six genes were selected for this study: diacylglycerol-O-acyltransferase 1, leptin, growth hormone receptor gene, β-lactoglobulin, k-casein AB and CE. A high coefficient of homozygosity was revealed for two genes CSN_AB and CSN_CE (0.705 and 0.897, respectively), which may lead in the near future to purely linear animals in herds. Despite the fact that no significant difference in the influence of the genotype on productive qualities was revealed for most indicators, the actual difference in them for agricultural organizations

Effect of genetic and paratypical factors on milk production in cattle