“…Among enzymes, phytochemicals, organic acids, antimicrobial peptides, anti-bacterial virulence drugs, minerals, bacteriophages, and probiotics (defined as “ live microorganisms which when administered in adequate amounts confer a health benefit on the host ”) are attractive non-invasive candidates [ 7 , 8 ]. Several studies emphasize that probiotics may be the most promising choice among alternative feed additives, and their beneficial effects in several animal species have indeed been demonstrated recently [ 1 , 2 , 3 , 9 , 10 , 11 , 12 , 13 ]. Probiotic action is complex; among the beneficial effects exerted by probiotics are stimulation of heat shock proteins, induction of cytokine production, antioxidant properties, enhancement of barrier function, and inhibition of pathogen adhesion and proliferation [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”