RBT-7/32 and RBT-11/17 as New Promising Strains for Use in Probiotic Feed Additives.

The normal functioning of a gastrointestinal microflora in poultry and livestock is of significant importance, since its imbalance negatively influences an organism's functions. In this study, the UV mutagenesis and selection were used to obtain two strains possessing antagonistic activity towards and , and their potential as a probiotic feed additive was evaluated. Compared to the parental strains, the ability of RBT-7/32 and RBT-11/17 strains to suppress increased by 77 and 63%, respectively; the corresponding ability of these strains to suppress increased by 80 and 79%, respectively.