 The study found that the prostrosymbiotic could be used as a suitable alternative to infeed antibiotics in poultry diets. It increased the growth rate and viability of young chickens, improved their natural resistance, livability, and productivity during the adult stage, and reduced fodder costs. Additionally, it increased egg production per laying hen, hatching egg yield, and hatched chick yield when administered to broiler parent stocks. This article was authored by V.S. Byarov and S.U. Metasova.