НЕКОТОРЫЕ ФАКТОРЫ, ВЛИЯЮЩИЕ НА ПРОДУКТИВНОЕ ДОЛГОЛЕТИЕ КОРОВ

Abstract

The relationship between the live weight of black-and-white and Ayrshire heifers in different periods of rearing and their productive longevity were studied. This issue had not been considered by scientists in a broad aspect. In this connection, its study is relevant. The aim of the study was to study the influence of the young cattle’s live weight in different periods of their rearing, in the process of development, and in dynamics, on the subsequent longevity of the dairy cows; this will increase the productive longevity of the main highly productive cow breeds in the Vologda region. To reach this goal, the following tasks were solved. Information on the retired broodstock of animals was collected. Samples by age categories of replacement young stock were made. The grouping of animals by live weight depending on their age was carried out. The information received was processed using economic and mathematical methods. Conclusions have been made. The role of replacement young cattle live weight on their subsequent productive longevity was studied at birth, at 10, 12 and 18 months. We have not identified the optimal live weight of calves at birth in the context of the studied breeds for their subsequent longevity. In animals in other analyzed age periods, groups of replacement young animals with optimal live weight were noted and identified. Moreover, these groups varied depending on the breed of animals. As a result of the research carried out, it is possible to recommend zootechnicians-practitioners certain conditions of feeding and keeping calves at different age periods to increase the productive longevity of the broodstock.