This study was to examine if it is possible to accelerate sorghum digestion in broiler chickens by targeting fermentation of the xylan.Cobb 500 broilers(n=960,80 birds per treatment)were fed 12 sorghum-soybean meal-based dietary treatments fed as 3 phases(starter d 0 to 12,grower d 13 to 23,finisher d 24 to 35),with 8 replicate pens of 10 birds per treatment.For half of the treatments(n=6),10％of the sorghum in the diet was directly replaced with 10％wheat bran,as a source of fermentable fibre.The diets were supplemented with either 0,50 or 2,000 mg/kg xylo-oligosaccharides(XOS),with or without xylanase application.Body weight gain(BWG),feed intake(FI)and feed conversion corrected for mor-tality(cFCR)was determined at d 0 to 35,and male and female body weight were measured on d 35.On d 35,ileum and caeca samples were collected from 2 birds per pen,for determination of caecal cellulase and xylanase activity,microbiota composition and short chain fatty acid(SCFA)concentration,and ileal XOS concentration.Supplementation with 2,000 mg/kg XOS caused increased BWG at d 0 to 35(P=0.007)and enhanced caecal propionic,valeric and succinic acid concentration(P＜0.05).Wheat bran increased Fl(P=0.018)and BWG(P=0.016),as well as caecal Bifidobacteria concentration(P＜0.001).Ileal XOS concentration was greatest when feeding combined wheat bran,2,000 mg/kg XOS,and xylanase,resulting in increased caecal total SCFA,acetic acid and butyric acid concentration,and xylanase and cellulase activity(P＜0.05).Results from this study present that feed efficiency in birds fed sorghum-based diets is improved as a consequence of supplementing with fermentable fibre,xylanase and XOS.

Natalie K.Morgan;Andrew Wallace;Michael R.Bedford

University of New England,School of Environmental and Rural Science,Armidale,New South Wales,Australia;Curtin University,Kent Street,Bentley,Western Australia,Australia;AB Vista,Woodstock Court,Blenheim Road,Marlborough Business Park,Marlborough,Wiltshire,England,United Kingdom

动物营养（英文）

[1]Natalie K.Morgan;Andrew Wallace;Michael R.Bedford-.Improving sorghum digestion in broilers by targeting fermentation of xylan)[J].动物营养（英文）,2022(03):198-206

finisher,xylo,BWG,cFCR,Ileal

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