RESUMO
BACKGROUND: Using probiotics have become popular. They are considered an alternative to Antibiotic Growth Promoters (AGP). Probiotics are supplemented into animal feed for improving growth performance along with preventing and controlling enteric pathogens. The aim of this work was to study the impact of dietary supplementation of Mannan-oligosaccharide and ß-Glucan (Agrimos®) on broiler challenged with Escherichia coli O78 (E. coli O78 - marked with an antibiotic (320 µg ciprofloxacin/ml broth) on growth performance, serum biochemistry, immune organs-histopathology, E-coli colonization, and hepatic transcripts of Tumor necrosis factor-alpha (TNF-α) and Nuclear factor-kappa B (NF-Ï°B). A total of 125 one-day-old chicks were used for conducting the experiment. Five one-day-old chicks were slaughtered for measuring the initial weight of the lymphoid tissue. The remaining chicks (120) were allotted into four groups according to Mannan-oligosaccharide and ß-Glucan supplementation, and E. coli infection. The data were analyzed using SPSS version 16. RESULTS: Results indicated significant alteration of growth performance, serum biochemistry, and selected liver gene expression with pathological lesions, especially in the lymphoid organs due to E. coli infection. These alterations were mitigated by Mannan-oligosaccharide and ß-Glucan supplementation. CONCLUSION: It could be concluded, Mannan-oligosaccharide and ß-Glucan supplementation in broiler's diet improved the immune response of broilers and mitigated pathological lesion resulted from E. coli infection.