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.
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.
Breeding black-motley cattle for productive longevity
The article presents the results of black-motley cattle linear breeding in the Vologda region. The linear dependence of black-motley cows’ useful life has been established both in purebred animals and in crosses with Holstein sires.
The growth and development of black-motley breed heifers having different feeding activity in the suckling period of growing
The article presents the results of the research on patterns of growth and development of breeding black-motley breed heifers having different indices of feeding activity in the early stages of suckling growing period. Young animals with high food activity in the initial stage of growing, eventually has intensive metabolism, greater live weight, and earlier maturity. Passive in relation to food animals have a tendency to levelling existing differences. At the same time these animals don’t achieve full compensation in the development by the time of the first insemination.
