Supplementation of Lactobacillus reuteri isolated from red jungle fowl along with mannanoligosaccaride improves growth performance, immune response and gut health in broiler Chicken

Abstract The present study was undertaken to investigate the effect of supplementation of Lactobacillus reuteri isolated from the intestine of red jungle fowl along with mannanoligosaccride (MOS) on growth performance, intestinal microbial count, immunity and expression of growth and immune related genes in broiler chicken. Lactobacillus reuteri was isolated from in the GIT tract of red jungle fowl and was utilized for growth bioassay in broiler. For this total 360 CARIBRO-Vishal broiler chicks were weighed individually and randomly allocated to nine treatment groups, each having five replicates with eight chicks in each following complete randomized block design (CRD). The experiment was conducted for 6 weeks duration. The nine treatment groups were control fed basal diet (T1), basal diet + Antibiotic growth promoter, bacitracin methylene disalicylate (BMD) @20mg/kg feed (T2), basal diet + commercial probiotic @ 0.1 g/kg feed (T3), basal diet + Lab isolated Lactobacillus reuteri @ 1x10 6 CFU/g of fermented feed (T4), basal diet + Lab isolated Lactobacillus reuteri @ 1x10 7 CFU/g of fermented feed (T5), basal diet + Lab isolated Lactobacillus reuteri @ 1x10 8 CFU/g of fermented feed (T6), basal diet + Lab isolated Lactobacillus reuteri @ 1x10 6 CFU/g of fermented + 0.1% MOS (T7), basal diet + Lab isolated Lactobacillus reuteri @ 1x10 7 CFU/g of fermented + 0.1% MOS (T8), basal diet + Lab isolated Lactobacillus reuteri @ 1x10 8 CFU/g of fermented feed + 0.1% MOS (T9). 20% of daily basal ration for broiler chicken was autoclaved and inoculated with 15% of Lactobacillus isolate broth culture having a viable count of 10 6 , 10 7 , and 10 8 CFU/ml and fermented at 37°C for 24 h before adding to daily ration afresh and was mixed well. Results of the present study revealed T9 group supplemented with Lab isolated Lactobaillus reuteri at the dose of 1x10 8 CFU/g along with 0.1% MOS significantly (P < 0.05) improves body weight, body weight gain, immune response both humoral and cell mediated without effecting the feed intake and feed conversion ratio (FCR). Also the pathogenic bacteria count (Salmonella and E.coli) was significantly (P < 0.05) lower in the GIT of T9 group as compared to other groups. The significantly (p < 0.05) higher relative expression of growth related genes, IGF-1 and IGF-1R and immune related gene, IL-6 whereas IL-10 and TLR-4 expression were significantly (P < 0.05) down regulated in T9 group (Lab isolated Lactobacillus reuteri @ 1x10 8 CFU/g of fermented feed + 0.1% MOS). So, it can be concluded from the present study that lactobacillus reuteri isolated for the GIT of the red jungle fowl along with MOS is effective in improving the growth performance, immune response and gut health of commercial CARIBRO-Vishal broiler chicken.