Evaluation of sires with respect to production of their daughters and proportion of holstein blood

Abstract

Abstract One of the best domestic dairy breeds is black-motley breed. At the same time, the Holstein breed has been one of the most highly productive for a long time. All world records for milk production were set by the Holstein breed. Moreover, it is very demanding in terms of management. In current conditions of the dairy cattle development, the semen of Holstein sires is still being used to increase the milk production of black-motley cows. Until today, there is no consensus on the optimal proportion of blood of the improving breed. The paper analyzes and evaluates the production of the daughters of sires depending on the proportion of blood of the Holstein breed. As a result, it was found that sires of Holstein lines have a positive effect on the production qualities of the black-motley breed, which ultimately leads to an increase in milk production. At the same time, in order to further improve the breeding and productive qualities of cows in herds, it is necessary to use sires assessed by the quality of the offspring, which are improvers in terms of milk yield and milk fat content. Consistent implementation of all technological solutions should be a fundamental factor in realization of the genetic potential.