On the problem of population conservation: the study of the reproductive characteristics of the Yakut cattle
The spontaneous nature and unpredictability of the cycling of the reproductive system of cows and heifers of the Yakut breed against the background of a low level of feeding, the structure of the herd of different ages does not allow planning work on insemination of animals. In addition, one of the negative aspects that complicate the work of reproduction in the gene pool farm is the location of these farms in the immediate vicinity of settlements, where a considerable number of livestock of other breeds are kept in organized and private farms. This greatly complicates the planned mating in order to keep the gene pool clean. In this regard, it is necessary to develop methods for induced estrus and ovulation of cows and heifers in order to control the reproductive function of cows and heifers of the Yakut breed in certain periods. This will make it possible to plan early mating in a shorter time, so that by the beginning of the pasture season, the breeding stock of Yakut cattle will be pregnant. An analysis of the breeding period in the gene pool farm for Yakut cattle, carried out after hormonal stimulation of Yakut cows, showed that the duration of the service period was reduced and averaged 68 days. As a result of the application of the scheme developed by us, young cows 4-6 years old were covered with bulls, pregnancy occurred on average in 2.22 hunts, 9-11 years old - in 3.33 hunts, in cows 12 and older - in 2.2 hunts.