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This study investigated the effects of an antimicrobial peptide (AMP), cLF36, on growth performance and the histophysiological changes of the intestine in  E. coli -challenged broiler chickens. A total number of 360 day old male chicks were randomly assigned to 4 groups of 6 replicates as follows: T1) negative control diet based on corn-soybean meal without  E. coli  challenge and additives; T2) positive control diet based on corn-soybean meal and challenged with  E. coli  without any additives; T3) positive control diet challenged with  E. coli  and supplemented with 20 mg AMP (cLF36)/kg diet; T4) positive control diet challenged with  E. coli  and supplemented with 45 mg antibiotic (bacitracin methylene disalicylate)/kg diet. Results showed that T3 improved growth performance and the jejunal morphology of  E. coli -challenged chickens similar to those of T4. While antibiotic non-selectively decreased the population of ileal bacteria, AMP increased the population of  Lactobacillus spp . and decreased harmful bacteria in the ileum of  E. coli -challenged chickens. Supplementing  E. coli -challenged chickens with AMP improved the gene expression of immune cells and upregulated the expression of tight junction proteins compared to other challenged groups. In conclusion, although cLF36 beneficially affected growth performance and the intestinal morphology of  E. coli -challenged chickens similar to those of the antibiotic group, this AMP drastically improved the intestinal microbiome, immune cells, and junctional proteins compared to other  E. coli -challenged birds, and can be nominated as an alternative for growth promoter antibiotics.

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Antimicrobial peptide, cLF36, affects performance and intestinal morphology, microflora, junctional proteins, and immune cells in broilers challenged with E. coli