The aim of the work was to study the clinical and physiological parameters of enzymatic and immune activity in newborn calves after the application of the domestic biological product Ribotan to their mother cows 3-9 days before calving. The objects of the study were 20 clinically healthy pregnant cows of the Black-and-white breed, selected according to the principle of paired analogues, which were divided into 2 groups (control and experimental) of 10 animals each (n=10), and newborn calves received from them. The cows of the experimental group were injected Ribotan given as a single dose intramuscularly in a dose of 5 ml 3-9 days before calving. The cows of the control group were injected isotonic sodium chloride solution. On the 2nd day of life, calves showed a decrease in lactic acid content by 45%, as well as a lactate/pyruvate ratio by 17.9%. An increase in the activity of superoxide dismutase by 50% and a decrease in the level of malondialdehyde by 25.8% were noted. It was found that the application of the biopreparation led to an improvement in clinical and physiological parameters in calves, namely: a firm standing position was realized 11.2 minutes faster, the sucking reflex formed 13.6 minutes faster. The level of total serum immunoglobulins increased by 63%. A higher level of colostral immunity caused a 2-3 – fold decrease in the incidence of omphalitis and gastrointestinal disorders in calves.