Abstract
Relevance. For the reproduction of the breeding stock of cattle, the conditions of detention should maximally meet the optimal conditions for the life of animals. In this regard, the study of the characteristics of physiological changes after injections of bioregulators to induce estrus in cows under various systems and methods of keeping is of great importance and is an important area of research. The purpose of the work is to study the reproductive function of cows depending on age and various conditions of keeping.Methods. The results of the work are based on analytical, biometric, statistical methods and the authors’ own research.Results. In studies was found that a general decrease in the effectiveness of the use of GnRH analogs and hCG to increase fertility can occur due to treatments carried out in the summer months. The greatest effect of the use of GnRH and hCG preparations should be expected when they are introduced in parallel with insemination in induced estrus in the winter-spring and autumn-winter months. At the same time, the fertility rates in cows tethered were slightly higher in the stall-pasture system of keeping, and slightly lower in the camp-pasture system than in loose ones. When studying the reproductive function, depending on the number of lactations, as a result of the use of a complex of bioregulators, high indicators of cows that came into the hunt were obtained, from 74 to 91% of the total number of animals showed signs of estrus according to the different number of lactations. Cows with 1st and 2nd lactation have the highest rate for those who came into heat (91% and 87%) with the lowest insemination efficiency (47% and 49%, respectively). In cows of the 3rd and 4th lactations, the highest adjustment to the restoration of the ovarian cycle is observed, with the average indicators of those who came to the hunt, the highest insemination efficiency was subsequently obtained (70 and 75%, respectively). For three or more months after calving, more than half of the herd of calving cows (71.6%) were fruitfully inseminated.
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