The results of a study of the polymorphism of the beta-casein (CSN2) and leptin (LEP) genes and the relationship of various combinations of their complex genotypes with milk productivity and the qualitative composition of milk from cows of the Holstein black-and-white breed of the Republic of Bashkortostan are presented. Cows with genotypes CSN2A1A1/LEPSC and CSN2A2A2/LEPST have the best indicators in terms of milk yield and milk composition.
black-and-white cattle, polymorphism, genotype, beta-casein, leptin, milk yield, qualitative composition of milk.
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