One of the methods of combating unwanted microflora is the use of antibiotics, however, along with positive properties, they have a number of significant disadvantages, in particular, the detrimental effect of both pathogenic and beneficial intestinal microflora. In this regard, there is an urgent need to replace antibiotics with safer substances, which increasingly include probiotics. The mechanism of action of probiotics is to selectively affect pathogenic microflora, without harming the beneficial one. In the course of the study, it was found that low-protein diets (low in protein, but balanced in amino acid profile) allow unlocking the potential of probiotic cultures of the Bacillus amyloliquefaciens strain and, as a result, reduce feed conversion by 0.08 kg/kg.