The effectiveness of using bulls of various breeding in the black-and-white breed population

The intensity of herd reproduction has a direct impact on the efficiency of dairy cattle breeding. The purpose of the research is to study in a comparative aspect the reproductive characteristics of the daughters of domestic and foreign breeding bulls on the breeding stock of 9,980 cows of the first calving of the modern population of the black-and-white breed in the Vologda Oblast. We have carried out an individual evaluation of servicing bulls by the method of rating assessment on a set of characteristics. The research establishes the superiority of the offspring offoreign bulls in terms of the average indicators of the studied traits with confidence (P