The impact and results of using sires in dairy cattle populations in the Vologda region

Studies were conducted on controlled populations of dairy cattle of Ayrshire, Kholmogory, Yaroslavl, black-and-white breeds of breeding farms in the Vologda region. It has been revealed that the sires of domestic selection have a greater degree of influence on the productive indices of their daughters than foreign ones do. The calculation of the breeding value of bulls in terms of their daughters' productivity has been carried out, and on the basis of a comparative analysis the best producers in the context of selections having the greatest impact on the productivity indices of descendants have been determined.