GROWTH AND DEVELOPMENT AND ACCLIMATIZATION OF HEIFERS OF THE THIRD GENERATION OF THE ABERDEEN-ANGUS BREED
Keywords:
Physiological adaptation, Canadian selection, European selection, growth and development, third generation, аberdeen-аngus breed, normotrophic, hypotrophic, coefficient of katabolism.Abstract
This article describes the research materials on adaptation and breeding of the aberdeen-angus breed of the third-generation calves in the conditions of the farm "Zholdasbay-Agro" of the North-Kazakhstan region. According to the results of study, the frequency of the development of antenatal hypotrophy in the newborn calves of the aberdeen-аngus breed of the Canadian selection on the totality of clinical signs was 12.3%, and in European calves - 8.7%. In terms of growth intensity up to 3 months of age, third-generation heifers obtained from European selection outperformed canadian selection peers by 3.9 kg (p<0.05), and heifers from 3 to 6 and 6 to 8 months of age obtained from canadian selection outperformed their European selection peers by 3.8 kg (p<0.04) and 6.5 kg (p<0.01), respectively. A high growth rate of heifers obtained from canadian selection cows was established starting from 3, 6 and 8 months, which is associated with their higher adaptive capacity compared to European selection heifers.
