Lifetime use of cows from different breeding bulls

The article presents the influence of the birthplace in Ayrshire producers from Vologda region on the lifetime productivity and terms of using their daughters in the breeding plants (Krasnaya Zvezda and Maysky integrated agricultural production companies). The selection influence on using of daughters is found out, namely high lifetime productivity indicators are typical for cows from imported producers, longevity and high fat content for the descendants of domestic bulls.