Abstract

The purpose of research was determining the degree of realization of the genetic potential of Yaroslavl cows of different genotypes. It was found out that the formation of productive traits in improved genotypes and purebred animals is different. The genetic potential of cows of the improved genotype of the Yaroslavl breed in milk yield exceeded purebred animals by 2,460 kg or by 51.9%. Milk yield of cows of the improved genotype were higher by 718-1574 kg than those of purebred Yaroslavl cattle, however, the degree of realization of the genetic potential was lower and amounted to 55.2-76.8%. Purebred cows of the Yaroslavl breed had a high degree of realization of the genetic potential for milk yield throughout the entire productive use - 68.0-82.2%, which indicates their better adaptive ability to the conditions of feeding and maintenance.

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