А. Т. Бисембаев The aim of the study is to establish the age dynamics of the variability of live weight with the average daily liveweight gain of the Kazakh white-headed breed of beef cattle. In all analyzed agricultural enterprises at the age of six months, the live weight of bulls varied from 172.4 kg to 196.5 kg, and in heifers – from 160.1 kg to 180.7 kg, respectively. According to the indicators of the average daily liveweight gain, there are som e differences between bulls and heifers. From birth to 210 days of age, the average daily liveweight gain was 846.03 g in bulls, 784.4 g in heifers; from 210 days of age to one year of age it was 732 g in bulls and 599 g in heifers; from birth to one year of age, the average daily liveweight gain was 793.6 g in bulls and 707.5 g in heifers. Bulls at the age of six months generally meet the requirements of the breed standard, characterized by high coefficients of variability. The live weight of bulls in the farms “Zhannat”, “Tolegen” and “Alem” at the age of six months meets and slightly exceeds the requirements of the breed standard by 15.2 kg (8.2%), 13.0 kg (7.1%), 13.6 kg (7.4%), and in heifers by 15.7 kg (8.9%), 8.1 kg (4.8), 13.2 kg (7.6%), respectively. The value of the coefficient of variability of live weight has average values with a slight excess in heifers. It was found that the live weight of bulls in the farm “Kairat” and the farm “Naryn” exceeded the breed standard by 26.5 kg (13.5%) and 21.1 kg (11%), heifers by 20.7 kg (11.5) and 7.8 kg (4.6%), respectively, and belongs to the elite classes. The average daily liveweight gain of young Kazakh white-headed breed in the studied farms varied from 826.7 to 944.2 g in bulls, and in heifers from 711.1 to 887.2 g, respectively that indicates a relatively high liveweight gain obtained in farm conditions.
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