Biotechnology of regulation of reproductive functions of Bos primigenius taurus

Since cattle are biologically capable of giving birth to only one calf per year, they are considered a single-fruited animal species. One of the cardinal methods of solving the problem of accelerated reproduction of livestock is biotechnological regulation of reproductive function in cows and synchronisation of their sexual activity. The aim of the study is to investigate the peculiarities of the reproductive function of Red Steppe cows under the influence of various methods of its regulation using modern hormonal agents. To evaluate the reproductive function of cows, generally accepted zootechnical methods were used, methods of variation statistics were used to calculate data, and biotechnological methods were used to regulate sexual activity in cows. Based on the analysis of the state of reproduction of the cattle herd, it was established that 164-187 cows and 85-96 heifers are artificially inseminated annually, which ensures the yield of calves per 100 cows of 89-91 heads and the annual introduction of 36 to 40 first-born calves per 100 cows. The shortened service period contributes to both a higher calf yield and an increase in milk yield, which is a desirable production effect. However, calving to conception interval, necessary to prepare the cow’s body for a new insemination, can be reduced to at least 30 days. Insemination of heifers with artificial insemination devices should be started when they reach a live weight of 314±6.5 kg, which will allow to obtain fertility from the first insemination at the level of 73.7-77.8% and thereby prevent obesity of heifers, which mainly reduces the percentage of fertility from the first insemination. It is necessary to establish obstetric and gynaecological examinations and treatment of problematic replacement heifers and cows, and it is advisable to use prostaglandin F2α analogues in combination with vitamins or biologically active drugs to stimulate the sexual function of cows and heifers. The use of prophylactic drugs will help to synchronise the heifers' sexual desire and increase their fertility during insemination. And the organisation of cattle reproduction and the proposed biotechnological ways to improve artificial insemination of the red steppe breed breeding stock will significantly improve their reproductive status, which will increase the overall economic efficiency of the industry