GROWTH AND DEVELOPMENT OF CALVES OBTAINED FROM COWS DURING EARLY INSEMINATION
Keywords:previously insemination, calves, heifers live weight, body measurements, body indices, black and white breed.
This article presents the results of research on the growth and development of calves obtained from cows during early insemination. The object of the study was calves from birth to 6 months of age of a black-and-white breed of a dairy farm "Kamyshenka" LLP in the Astrakhan district of the Akmola region. Two experimental groups of calves were formed in a dairy farm. Group I included calves from cows inseminated at 14-15 months of age, and group II included calves from cows inseminated at 16-17 months of age. The following indicators were studied: live weight of calves at birth and at the age of 6 months, average daily, absolute and relative increases in live weight were calculated. At the same time, the exterior profile was studied by measurements from birth to 6 months of age, followed by the calculation of body indices. The live weight of calves at birth in the first experimental group averaged 30.9±0,32 kg, while in the second it was at the level of 29.8±0,44 kg, and at the age of 6 months it was 149.2±2,3 kg and 147.3±2,4± kg, respectively. According to the exterior profile data, there are also better indicators in the first experimental group than in the second, since the oblique length of the trunk was 104.43±0,7 and 102.33±0,9 cm, respectively. The difference in body type indices ranged from 0.58-1.41%, respectively.