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This research focused on the effects of different doses of Bacillus subtilis KN-42 on the growth performance, diarrhea incidence, faecal bacterial flora, and the relative number of Lactobacillus and Escherichia coli in faeces of weaned piglets to determine whether the strain can serve as a candidate antimicrobial growth promoter. A total of 360 piglets (initial body weight 7.14±0.63 kg) weaned at 26±2 days of age were randomly allotted to 5 treatment groups (4 pens per treatment with 18 pigs per pen) for a 28-day trial. Dietary treatments were basal diet without any antimicrobial (negative control; NC), basal diet supplemented with 120 mg/kg feed of neomycin sulfate (positive control; PC) and basal diet supplemented with 2×10(9) (L), 4×10(9) (M) and 20×10(9) (H) CFU/kg feed of B. subtilis KN-42. During the overall period, average daily gain and feed efficiency of piglets were higher in groups PC, M, and H than those in group NC (p&lt;0.05), and all probiotics and antibiotics groups had a lower diarrhea index than group NC (p&lt;0.05). The 16S rDNA gene-based methods were used to analyze faecal bacterial flora on day 28 of experiment. The result of denaturing gradient gel electrophoresis analysis showed that supplementation of B. subtilis KN-42 to the diet changed the bacterial communities, with a higher bacterial diversity and band number in group M than in the other four groups. Real-time polymerase chain reaction analysis showed that the relative number of Lactobacillus were higher in groups PC and H than in group NC (p&lt;0.05), and the supplemented B. subtilis KN-42 to the diet also reduced the relative number of E. coli (p&lt;0.05). These results suggest that dietary addition of B. subtilis KN-42 can improve the growth performance and gastrointestinal health of piglets.

Effects of &lt;i&gt;Bacillus subtilis&lt;/i&gt; KN-42 on Growth Performance, Diarrhea and Faecal Bacterial Flora of Weaned Piglets

Effects of <i>Bacillus subtilis</i> KN-42 on Growth Performance, Diarrhea and Faecal Bacterial Flora of Weaned Piglets