Efficiency of growth dynamics of bulls-sires of different breeds in the Oryol population of dairy cattle

Competent use of the genetic potential of bulls-producers in the conditions of the Oryol region is the key to obtaining high-value replacement young stock. In the criteria for the selection and selection of such bulls, an important role is assigned to phenotypic indicators, including growth and development. In this regard, the purpose of this article is a comparative study of the growth dynamics of bulls-producers of Black-and-White, Holstein and Simmental breeds. The data obtained showed a significant increase in the live weight of the latter in comparison with Black-and-White animals, especially for 18 months of life - by 6.7 (P