The study was conducted for the first time on rams of the Karakul Moldavian breed. As an antioxidant, two versions of the ZooBior preparation were used, which contains: BioR, spirulina, zinc and selenium. The preparation was given to rams in teenium for 50 days at the rate of 5 g/head/day. Studies have shown that the ZooBior drug increased the volume of ejaculate by 0.4 ml in the second experimental group, the motility by 11%, the concentration of sperm in the sperm by 0.1 billion/ml and the total number of sperm in the ejaculate with rectilinear movements. With 6.5%, the data are reliable compared with the indicators found at the beginning of the experiment. There have also been some fluctuations in sperm kinetics. Semen advancement rate increased in the experimental groups, but the data are not significant.