GE ASPECTS OF CHANGE OF REPRODUCTIVE FUNCTION TREASURES MANUFACTURERS
A study of the quality of sperm, taking into account the age of the stallions-producers. Such indicators as the volume of ejaculate and the concentration of sperm in all age groups corresponded to current standards. Sperm activity and vitality were lower than the normative criterion for young and older stallions, and this indicator was doubled in the number of sperm with abnormal morphology in these groups. It is noted that the number of defective sperms in the producer decreases by the time of its physiological maturity. In full-aged stallions, 16.8% of pathologies of the neck and tail were observed, but this is 1.5-2 times less compared to other age groups of producers. Biochemical parameters of stallion sperm, such as total protein and its fractions, enzymes lactate dehydrogenase, creatine phosphokinase, alkaline phosphatase and gamma-glutamyltranspeptidase, had age-related dynamics and were characterized by the highest content in full-aged stallions. So, among young stallions and older stallions, the lowest CPK content was 1757.33 U / L and 783 U / L, respectively. In full-aged stallions, the CPK level was 1993.25 U / L. An analysis of the results allowed us to identify a clear difference between age groups in alkaline phosphatase activity: the content of alkaline phosphatase in full-aged stallions exceeds this indicator in young individuals by 2.6 times and 6.2 times in older adults. It was established that sperm of full-aged stallions was rated the highest in quality. To preserve the genetic potential in breeding, we recommend the selective use of promising young stallions, as well as the use of sperm of valuable older stallions.