Milk productivity and milk quality of cows with different OLR1 genotypes and linear affiliation

Literature data show that the genotype at the locus of the low-density lipoprotein receptor (OLR1) gene and the linear affiliation of the Holstein breed in cows have an impact on milk productivity and the quality of their milk. In this regard, the purpose of our research was to study the milk productivity and qualitative composition of the milk of Tatarstan-type cows with different genotypes of the low-density lipoprotein receptor (OLR1) and linear belonging to the Holstein breed. Studies conducted in the conditions of the Republic of Tatarstan have shown that the most productive heifers of the Tatarstan type with the genotypes OLR1/AC and OLR1/CC of the low-density lipoprotein receptor gene in comparison with peers of the OLR1/AA genotype. Among the dairy cows belonging to the lines of W. Ideal 933122 and R. Sovering 198998 of the Holstein breed, animals with the OLR1/AC genotype also differed favorably. It should be noted that individuals with the OLR1/AA genotype of the W. Ideal 933122 line were characterized by the lowest milk productivity.