REPRODUCIVE QUALITIES OF PRIMARY COWS AND ANALYSIS OF THE REASONS FOR THEIR CULTURE
Studies on the study of reproductive qualities, the reasons for the culling of first-calf cows, depending on the age of the first insemination, were conducted on the basis of leading breeding plants for breeding black-and-white cattle breeds. The purpose of this study is to determine the reproductive qualities of first-calf cows, as well as to analyze the reasons for their culling, depending on the age of the first insemination. To do this, the following tasks were set: to analyze the reproductive qualities, the viability of the offspring, the fertility index, the reasons for culling. In our studies, at the first insemination, the largest live weight was in the fifth group - 436 kg, and the smallest in the first group - 370,9 kg. At the first hotel, the largest live weight was in animals of the fifth group - 540,2 kg. They outperform the animals of the first group by 5,4%. We found that in the third group milk yield was at the level of 25785 kg, and in the third - 18486 kg. The greatest safety of cows during three lactations is in the third group - 72,4%. According to our research, it was found that cows of all groups have a service period exceeding the norm. It was at the level of 128 days to 133 days in all groups. The duration of the dry period was in the groups from 54,9 to 56,1 days. His highest indicator was in the fifth group - 56,1 days. The duration of pregnancy in the groups ranged from 272,1 to 281,1 days. The highest coefficient of reproductive ability was in the third experimental group. The yield of calves was high in the third group - 85,3 heads. The most difficult calving was in the first experimental group - 22,3%.