Introduction. The effectiveness of animal husbandry development mainly depends on the maximum preservation and cultivation of healthy and productive young animals. In the structure of pathologies of young animals, gastrointestinal diseases occupy one of the leading places in terms of frequency, mass manifestations cause significant death of nascent young animals, reduce productivity and thereby cause significant economic damage to farms. The article presents the results of the embryotoxic effect of the biological product “Molasses” in experiments on white rats for calves. The aim of the study was to study the embryotoxic effect of the biological product “Molasses” in experiments on white rats for cattle calves. Materials and methods. Studies of the embryotoxic effect were carried out on 18 female white rats weighing 200‒220 g. The animals participating in the experiment were divided into 3 groups, 6 rats each. Each group of rats was divided into 2 subgroups, 3 in the control group and 3 in the experimental group. In the evening, the females were placed next to the males, and in the morning of the next day, a swab from their vagina was examined. The day of detection of sperm in the smear in rats was taken into account for the main moment of ovulation of the animals. Research results. During the observation and study of the embryotoxicity of the Molasses biopreparation for the entire twenty-day period in white rats, the average embryo weight of the control group was 2.38±0.01 g. in the experimental group, 2.40±0.01 g. that did not differ significantly in weight. During the entire experimental observation period, it was found that the clinical condition of animals treated with the Molasses biopreparation did not negatively affect the reproductive function and development of embryos.