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1. This study aimed at the effects of a novel  Lactobacillus bulgaricus  ( L. bulgaricus ) strain and enterohemorrhagic  Escherichia coli  ( E. coli )  O157: H7  on intestinal flora and growth performance of broilers, and the protective effect of  L. bulgaricus  on broilers in challenged experiment by  E. coli O157: H7 . 2. In vitro bacteriostatic test showed that the cell-free supernatant (CFS) of  L. bulgaricus  isolate had an obvious inhibitory effect on  E. coli O157: H7 . 3. Eighty 1-day-old male broilers were randomly assigned into four treatment groups with four replicates per treatment. All groups received a basal diet in addition to the specific treatments: NC group, gavage with normal saline; In LBP group, gavage with  L. bulgaricus  isolate (1 × 10 9  CFU/mL) during the whole process and challenged with  E. coli O157: H7  (3 × 10 9  CFU/mL); EC group, gavage with  E. coli O157: H7  (3 × 10 9  CFU/mL); LB Group, gavage with  L. bulgaricus  isolate. At the age of 21 d, broilers were weighed and feed conversion ratio (FCR) was calculated. Caecum and caecal contents, ileum and faeces samples were taken after slaughter. 4. The challenge of  E. coli O157: H7  resulted in an increase in TLR-4, NF-κB and IL-8  mRNA  in caecal tissue, a decrease in Villus: crypt ratio in ileum, a decrease in the overall diversity of intestinal microflora and a poor FCR. 5. The  L. bulgaricus  isolate decreased the  mRNA  expression of TLR-4, NF-κB and IL-8 induced by  E. coli O157: H7 , reduced the content of  E. coli O157: H7  in the caecum of broilers, increased the villus: crypt ratio, increased the abundance of beneficial bacteria and overall diversity of intestinal microflora, and improved FCR. 6. The  L. bulgaricus  isolate can maintain the intestinal health, improve the growth performance of broilers and reduce the colonisation of  E. coli O157:H7  in the caecum.

british poultry science

A novel  Lactobacillus bulgaricus  isolate can maintain the intestinal health, improve the growth performance and reduce the colonization of  E. coli O157:H7  in broilers