title: Xylanase supplementation improves the nutritive value of diets containing high levels of sorghum distillers' dried grains with solubles for broiler chickens.
abstract: BACKGROUND
  An experiment was conducted to investigate the effect of sorghum distillers' dried grains with solubles (sDDGS) and xylanase supplementation in broiler chicken diets. A total of 432 Cobb-500 day-old male broiler chicks were used in a 4 × 2 factorial design (0, 100, 200 or 300 g kg(-1) sDDGS with or without xylanase supplementation). Each treatment was replicated six times with nine birds per replicate in a 35 day study.
  
  
  RESULTS
  Feed intake was increased (P < 0.001) throughout the study with the inclusion of dietary sDDGS. Body weight gain (BWG) was unaffected except for the last 2 weeks of study, when birds that received 200 and 300 g kg(-1) sDDGS had higher (P < 0.001) BWG. Feed conversion ratio (FCR) increased (P < 0.05) as sDDGS in the diet rose to 100 g kg(-1) during the starter phase and the whole period of study. Over the starter period, xylanase supplementation improved (P < 0.05) FCR, particularly for the highest inclusion of sDDGS. Protein digestibility deteriorated (P < 0.001) as sDDGS in the diet rose to 300 g kg(-1) . Xylanase reduced (P < 0.001) the concentration of xylose in the ileum of birds. The activities of sucrase and maltase in the jejunal mucosa were reduced when birds were offered 200 and 300 g kg(-1) sDDGS. Incorporation of sDDGS increased (P < 0.01) the total short-chain fatty acid concentration in the caeca.
  
  
  CONCLUSIONS
  The results showed that diets containing large amounts of sDDGS will benefit from xylanase supplementation, particularly in terms of FCR.
authors.affiliation: School of Environmental and Rural Science, University of New England, Armidale, NSW, 2351, Australia.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Barekatain
authors.forename: Mingan
authors.initials: M
authors.lastname: Choct
authors.forename: Paul A
authors.initials: PA
authors.lastname: Iji
mesh_terms: D000821:Animal Feed; D000822:Animal Husbandry / Q000379:methods; D000824:Animal Nutritional Physiological Phenomena / Q000187:drug effects*; D000818:Animals; D002645:Chickens / Q000378:metabolism*; D004032:Diet / Q000592:standards / Q000662:veterinary*; D004044:Dietary Proteins / Q000378:metabolism; D019587:Dietary Supplements; D004063:Digestion; D043364:Endo-1,4-beta Xylanases / Q000494:pharmacology*; D002149:Energy Intake / Q000187:drug effects; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005656:Fungal Proteins / Q000494:pharmacology; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D009753:Nutritive Value; D028321:Plant Preparations / Q000494:pharmacology; D045868:Sorghum; D013393:Sucrase / Q000378:metabolism; D015430:Weight Gain / Q000187:drug effects; D014994:Xylose / Q000378:metabolism*
chemical_list: D004044:Dietary Proteins; D005232:Fatty Acids, Volatile; D005656:Fungal Proteins; D028321:Plant Preparations; D014994:Xylose; D013393:Sucrase; D043364:Endo-1,4-beta Xylanases