首页|Diet xylo-oligosaccharide supplementation improves growth performance,immune function,and intestinal health of broilers
Diet xylo-oligosaccharide supplementation improves growth performance,immune function,and intestinal health of broilers
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The effects of xylo-oligosaccharides(XOS)on broiler growth performance,immune function,and in-testinal health were investigated.A total of 540 one-d-old Arbor Acres Plus broilers were randomly divided into 5 groups with 6 replicates per group and 18 chickens per replicate.Broilers in the control(CON)group received a corn-soybean meal based basal diet,those in the antibiotics(ANT)group received the basal diet plus 500 mg/kg oxytetracycline,and those in XOS groups received the basal diet plus 150,300,or 450 mg/kg XOS.Compared with CON,the body weight at 42 d and average daily gain from 1 to 42 d were significantly increased in the 150,450 mg/kg XOS-added and ANT groups(P=0.018),and the relative expression of claudin-1 and ZO-1 mRNA in the ileum was significantly higher in the 300 and 450 mg/kg XOS-added groups(P＜0.001).The feed conversion ratios(P＜0.001)and abdominal fat rates(P=0.012)of broilers from 1 to 42 d of age were significantly lower in all XOS-added groups than in the control group.Splenic index(P=0.036)and bursa of Fabricius index(P=0.009)were significantly better in the ANT group and each XOS-added group than in the control group.Compared to CON and ANT,serum IgA(P=0.007)and IgG(P=0.002)levels were significantly higher in the 300 mg/kg XOS-added group,and the relative abundance of short-chain fatty acid-producing genera(Alistipes)was also significantly higher(P＜0.001).Meanwhile,ileal villus height(P＜0.001)and ratio of villus height to crypt depth(V:C)(P=0.001)were significantly increased in XOS-added broilers.In analysis of re-lationships between cecal microbes and the physical barrier of the gut,[Ruminococcus]_torques_group was positively correlated with mRNA expression of ileal ZO-1 and claudin-1(P＜0.05),and Bacteroides was positively correlated with increased ileal villus height and V:C(P＜0.05).Overall,XOS addition to broiler diets improved growth performance,promoted intestinal health by enhancing intestinal barrier function and regulating cecal microbiota diversity,and had positive effects on immunity.
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