КОРЕКЦІЯ СПЕРМОПРОДУКТИВНОСТІ БАРАНІВ–ПЛІДНИКІВ ГОРМОНАЛЬНИМИ ПРЕПАРАТАМИ

In sheep breeding, when organizing the reproduction process, a special focus is given to rams which produce a large number of descendants by artificial insemination, and thus exert their influence as the genetic basis carriers on the breeding, productive, and technological properties of large groups or herds of sheep. The systematic use of artificial insemination of only high prepotent rams is the key to improving the qualitative composition of herds and increasing their productivity. Therefore, it is important to objectively assess the reproductive function of rams when used in breed and commercial herds. Despite the fact that spermatogenesis in rams under normal conditions of keeping and balanced feeding occurs continuously, numerous studies and practical observations indicate that environmental, seasonal and climatic factors affect sexual activity, intensity of spermatogenesis, sperm quantitative and qualitative indicators. The analysis of literature data on the impact of various environmental factors on sperm production in rams has been conducted. It is reported that seasonal environmental factors can significantly affect sexual activity and quantitative and qualitative indicators of sperm. This relationship is shown more clearly in pasturing conditions, that is with direct and prolonged contact of an animal with natural environmental factors. The results of the scientists’ research on developing and applying basic methods of stimulating the sexual activity of rams during breeding and non–breeding periods have been given. It is shown that hormones are mostly used to stimulate sexual activity and correction of sperm production in rams. The results of research on the impact of phytoestrogens on the reproductive function of males have been analysed.