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Study of Bacillus subtilis on growth performance, nutrition metabolism and intestinal microflora of 1 to 42 d broiler chickens

  • 2017-06
  • Animal Nutrition 3(2)
    • Zhenhua Gao
    • Haohao Wu
    • Lin Shi
    • Xiaohui Zhang
    • R. Sheng
    • Fuquan Yin
    • R. Gooneratne

Abstract

To study the influence of different levels of Bacillus subtilis on growth performance, nutrition metabolism and intestinal microflora of 1 to 42 d Arbor Acres (AA) broilers, a total of 800 one-day-old healthy broilers were randomly divided into 5 groups with 4 replicates per group and 40 broilers per replicate. Broilers were fed a basic diet (group 1) which acted as the control group, and 4 other groups (2 to 5) were fed the basal diet with B. subtilis added at concentrations of 100, 150, 200 and 250 mg/kg, respectively for 42 days. The results showed as follow: the average daily gain (ADG) of group 4 was significantly higher than (P < 0.05) that of group 1, and the average daily feed intake (ADFI) of group 5 was the highest but the differences between groups were not significant (P > 0.05). The feed to gain ratio (F/G) of all the experimental groups was lower than that of the control and the difference was significant in group 4 (P < 0.05). In addition, supplementation of B. subtilis increased the apparent metabolism of crude protein (P > 0.05), crude fat (P > 0.05), dry matter (P > 0.05) and organic matter (P < 0.05). B. subtilis decreased the Escherichia coli and Salmonella populations in the cecum. This shows that adding B. subtilis to the broiler diet can improve the growth performance, increase feed efficiency, regulate serum index and reduce harmful bacteria in the intestinal tract. Based on our study, it could be recommended that addition of B. subtilis at 200 mg/kg could improve the growth performance of broilers.

Keywords: AA broilers; Bacillus subtilis; Growth performance; Intestinal microflora.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Bacillus SubtilisImproved Feed EfficiencyBeneficial
Moderate
Bacillus SubtilisImproved Growth PerformanceBeneficial
Large
Bacillus SubtilisImproved Nutritional MetabolismBeneficial
Small
Bacillus SubtilisReduced Harmful Intestinal BacteriaBeneficial
Large
Bacillus subtilis AB22Enhanced Metabolism of Organic MatterBeneficial
Small
Bacillus subtilis AB22Reduced Harmful BacteriaBeneficial
Moderate
Bacillus subtilis HU58Improved Feed EfficiencyBeneficial
Moderate
Bacillus subtilis HU58Improved Growth PerformanceBeneficial
Large
Bacillus subtilis HU58Improved MetabolismBeneficial
Moderate
Bacillus subtilis HU58Reduced Harmful BacteriaBeneficial
Moderate
Bacillus subtilis MB40Improved Feed EfficiencyBeneficial
Moderate
Bacillus subtilis MB40Improved Growth PerformanceBeneficial
Large
Bacillus subtilis MB40Improved Nutrient MetabolismBeneficial
Moderate
Bacillus subtilis MB40Reduced Harmful Bacterial PopulationsBeneficial
Moderate
Bacillus subtilis SNZ-1972Improved Average Daily GainBeneficial
Large
Bacillus subtilis SNZ-1972Improved Feed EfficiencyBeneficial
Moderate
Bacillus subtilis SNZ-1972Improved Nutrient MetabolismBeneficial
Moderate
Bacillus subtilis SNZ-1972Reduced Harmful BacteriaBeneficial
Moderate
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