Fig. 2From: Implication and challenges of direct-fed microbial supplementation to improve ruminant production and healthMode of action of proposed DFMs in the lower digestive tract of ruminants. A Enhancement of gut barrier function; B Reduction of luminal pH by producing lactic acid; C Production of antimicrobial compounds (e.g., organic acids, hydrogen peroxide, bacteriocins); D Adherence and competing for nutrients; E Stimulation of host immune response; F Stimulation of expression and turnover of neurotransmitters (e.g., serotonin)Back to article page