Currently, the search for alternative ways to replace the use of antibiotics in animal husbandry is being intensively conducted all over the world, including in Russia. One of the possibilities for the replacement of antibiotics in feed mixtures is the development and testing of probiotics in production conditions. They are biomass of bacteria in vegetative or spore form with a clearly expressed antagonistic activity to the pathogenic and conditionally pathogenic microflora of the gastrointestinal tract chyme. Probiotics have a beneficial effect on the animal's body. Animals' saprophytic microflora is capable of producing biologically active substances in the course of their vital activity, suppressing the growth of pathogenic microorganisms, malignant tumors, and normalizing various pathological and biochemical processes in the animal body. The outcomes of research on the use of the Bioprimum Sukhoy (dry) feed additive added in different dosages into cows' diets. It was found that feed additive introduction in the cows' diet composition at a dosage of 75 mg/kg of dry matter of feed resulted in an increase of hemoglobin and red blood cell content in the bloodstream by 11.40 and 6.05%, respectively, compared with analogs of the control group, an increase in milk productivity by 13.8%, the amount of milk fat by 14.8% and milk protein by 14.2%.
