Selection criteria and characterization of sporulating bacterial strains of genus Bacillus – the basis of probiotic preparations and feed additives for livestock

Screening of sporulating bacterial strains of genus Bacillus isolated from various natural sources was carried out. The most active antagonistic bacteria were chosen. Probiotic properties of the selected spore-farming Bacillus were investigated: spectrum of antimicrobial action, safety for macroorganism, survival in transit via gastrointestinal tract (bile and acid resistance), lack of inhibiting effect on gut microbiota, native non-plasmid resistance to widely applied antimicrobial agents. The prospects of using the most active cultures as key components of probiotics and feed additives for farm stock, poultry and fish were demonstrated.