The studies were carried out on the semen of breeding boars with low quantitative and qualitative indicators. For the stimulation of spermatogenesis, it was used the ZooBioR preparation developed by the Institute of Microbiology and Biotechnology of the Republic of Moldova. The drug was introduced into compound fodder as an additional component at the rate of 10 ml per head per day, for 50 days. At the beginning and at the end of the experiment, the quantitative and qualitative parameters of sperm were examined. After 50 days of feeding, the volume of ejaculate increased by 6.6%, the concentration of sperm in the semen by 6.25%, the activity of sperm by 2.86%, and the number of doses from one ejaculate increased by 13.22%.