Journal
RESEARCH IN VETERINARY SCIENCE
Volume 93, Issue 1, Pages 264-268Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.rvsc.2011.05.021
Keywords
Bacillus subtilis LS 1-2; Performance; Apparent nutrient retention; Intestinal morphology; Broilers
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Present study investigated the effect of dietary supplementation of Bacillus subtilis LS 1-2 on growth performance, apparent nutrient retention, caecal microbial population and intestinal morphology in broilers. Three hundred and twenty day-old Ross broiler chicks were randomly allotted to four treatments on the basis of BW in a randomized complete block design. Experimental diets were fed in two phases: starter (d 0-21) and finisher (d 22-35). Dietary treatments were basal diet supplemented with 0% (control), 0.15%, 0.30% and 0.45% B. subtilis LS 1-2. Supplementation of increasing levels of B. subtilis LS 1-2 showed linear improvement (P < 0.05) in growth performance and apparent nutrient retention. At d 35, birds supplemented with increasing levels of B. subtilis LS 1-2 showed decrease in caecal Clostridium and Coliform count (linear, P < 0.05). Moreover, supplementation of B. subtilis LS 1-2 increased (linear, P <0.05) villus height and villus height to crypt depth ratio in both duodenum and ileum. Results obtained in the present study indicate that B. subtilis LS 1-2 can be used as a growth promoter in broiler diets and can improve intestinal microbial balance and gut health of broilers. (C) 2011 Elsevier Ltd. All rights reserved.
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