Rating assessment of bulls-producers of the Yaroslavl breed according to reproductive signs in the conditions of the Vologda region

According to the presented data, the foreign-bred bull-producer Retirement 11720463 occupies a leading position in such reproductive signs as the service period, the age of the first productive insemination and the age of the first calving, thereby surpassing the domestic-bred bull Lornet 1026 by 38.2 days; 0.6 months and 0.6 months, respectively. The daughters of the bull Lornet 1026 have lower insemination index than the daughters of the foreign-bred bull, the gap between them is 0.2.