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This study assessed the effect of autochthonous probiotic Pediococcus pentosaceus RM119 on gut health, growth, and nutrient utilization in calves. Twelve buffalo calves (<15 d) were divided into two groups, control without probiotics, and probiotic group with P. pentosaceus RM119 @ 108 CFU/calf/d. The probiotic group showed a reduction (p < 0.05) in fecal score, diarrhea episodes and duration of diarrhea. The fecal pH, fecal ammonia was lower, whereas lactate was higher in probiotic group than control. There was a significant increase (p < 0.01) in the concentration of fecal acetate, propionate and butyrate levels in the probiotic supplemented group. The fecal lactobacilli and bifidobacterium were higher (p < 0.01), whereas, fecal coliform and clostridial count were lower (p < 0.01) in P. pentosaceus RM119 supplemented group. There was an improvement in reduced glutathione anti oxidant. Overall, buffalo-gut origin P. pentosaceus RM119 reduced the frequency and severity of diarrhea in neonatal buffalo calves and improved the gut health. [ABSTRACT FROM AUTHOR]