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DNA samples of cows of Simmental and Kholmogory breeds served as the material for the research. Release of DNA was carried out by a standard method of phenolchloroform extraction. Polymorphisms of rs43703015 of the CSN3 gene, rs109625649 of the LGB gene and rs134028641 of the PRL gene are studied by means of PCR-RFLP analysis. In all studied selections, the A allele prevails on the CSN3 gene. The frequency of the A allele prevailed over the frequency of the B allele on the PRL gene. The animals with the greatest milk yield and fat content of milk on the CSN3 gene had the genotype including the A allele. Depending on the LGB genotype, there was established that the largest size of milk yields have individuals with the AA and AB genotype in selections of the Simmental breed of both selections. In selection of the Kholmogory breed - with the B genotype. Adaptation process is fraught with a serious pressure, that, undoubtedly, affects the efficiency; while long-acting it leads to disorder of physiological functions. Therefore, realization of genetic potential of the delivered cattle to Yakutia will require time.
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