Cows reproductive function correction in the postpartum period

The purpose of research is to study the reproductive function of cows in the postpartum period under various conditions. Objectives: to analyze and summarize the data on the assessment of the use of bioregulators on the reproductive ability of cows, depending on the method of keeping. The experiments were carried out in 2018-2020 on the farm of the SPK Plemzavod-Alga of the Krasnokamsky District of the Republic of Bashkortostan with tethered and loose-fitting method of keeping black-and-white cows, aged three to five years, with a lactation milk yield of 6,500 kg. A control and two experimental groups of animals were formed that did not become pregnant in total after two inseminations, while no clinical signs of abnormalities in the reproductive system were found. To determine the nature of ovarian activity, rectal examinations of cows were performed. The test results showed that the level of fertility rates was the highest in the group of animals treated with gestational mares' serum gonadotropin and estrofan, and ranged from 48 to 70%, while the effect of the drugs was higher in all cows with loose housing. When determining the effectiveness of the introduction of surfagon and ovulin before insemination, it was found that after synchronized hunting in cows with loose housing, with the introduction of surfagon before insemination, the fertility was 70%, ovulin - 63.3 % in the control of 46.6 %, with a tethered housing - 60; 63.3 and 33.3 % respectively. When using the vitamin-amino acid complex Vitam and the gonadotropic drug Ovulin, the service period of cows with a tethered method of housing was 122 days, for animals with a loose method of keeping - 120 days, i.e., compared with cows of the control group (137 days) less respectively for 15 and 17 days. The introduction of the vitamin-amino acid complex Vitam into the hormonal treatment scheme stimulates the process of hematopoiesis and enhances the nonspecific resistance of the organism, and has a beneficial effect on the metabolic processes of animals.