Effects of Bacillus subtilis UBT-MO2 on growth performance, relative immune organ weight, gas concentration in excreta, and intestinal microbial shedding in broiler chickens

By Z. Zhang, J. H. Cho, I. H. Kim. 2013

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Abstract This study was conducted to investigate the effects of Bacillus subtilis UBT-MO 2 on growth performance, relative immune organ weight, gas concentration in excreta, and intestinal microbial shedding in broiler chickens. A total of 480 1-d-old mixed sex broilers were randomly allotted to a 2×2 factorial arrangement of treatments with 2 levels of enramycin (0 or 5 ppm) and B. subtilis (0 or 10 5  cfu/kg) for 35 d. Each treatment had 6 replicate pens with 20 broilers in each pen. Diets were fed in 2 phases: starter phase (from d 0 to 21) and grower phase (from d 22 to 35). Overall, broilers fed diets supplemented with B. subtilis had 4.4% greater ( P =0.01) body weight gain than those fed non-probiotic diets. The feed conversion ratio in broilers fed diets containing enramycin was decreased by 2.8% and 4.2% during d 0–21 ( P =0.05) and throughout the experimental period ( P =0.02), respectively, than those fed diets without antibiotic. Broilers fed B. subtilis diets had 30.9% greater ( P =0.02) relative weight of thymus than those fed diets without probiotic. Dietary supplementation with B. subtilis resulted in 26.9% and 37.9% lower ( P =0.03) NH 3 and H 2 S concentrations, respectively, in excreta compared with no supplementation. However, no differences were observed in intestinal bacterial concentrations among treatments. In conclusion, dietary supplementation with 10 5  cfu/kg of B. subtilis could improve the growth performance of broiler chickens, and reduced NH 3 and H 2 S emissions.

Subfields: Animal Science and Zoology, Aquatic Science

View Paper: https://www.semanticscholar.org/paper/a955c2c7a04c3e28c8488af341adab71d76c43ba

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