Effects of Xylanase on Performance, Blood Parameters, Intestinal Morphology, Microflora and Digestive Enzyme Activities of Broilers Fed Wheat-based Diets

  • Luo, Dingyuan (College of Animal Science and Technology, Northwest A&F University) ;
  • Yang, Fengxia (College of Animal Science and Technology, Northwest A&F University) ;
  • Yang, Xiaojun (College of Animal Science and Technology, Northwest A&F University) ;
  • Yao, Junhu (College of Animal Science and Technology, Northwest A&F University) ;
  • Shi, Baojun (Guangdong VTR Bio-tech Co.Ltd.) ;
  • Zhou, Zhenfeng (College of Animal Science and Technology, Northwest A&F University)
  • Received : 2009.01.20
  • Accepted : 2009.04.13
  • Published : 2009.09.01


The study was conducted to investigate the effects of different levels of xylanase on performance, blood parameters, intestinal morphology, microflora and digestive enzyme activities of broilers. The wheat-based diets were supplemented with 0, 500, 1,000, 5,000 U/kg xylanase. Xylanase supplementation significantly (p<0.05) improved the feed:gain ratio of broilers from 1 to 21 d and 1 to 42 d. Supplementing 500 U/kg and 1,000 U/kg xylanase improved (p<0.05) the villus height and the ratio of villus height to crypt depth in the small intestine. Excess supplementation of xylanase (5,000 U/kg) increased the villus height in the ileum (p<0.01) and the ratio of villus height to crypt depth in the duodenum and ileum (p<0.05). The microflora in the ileum and caecum, digestive enzyme activities in the small intestine and the concentrations of serum glucose, uric acid, insulin and IGF-I were not affected by the supplementation of xylanase. Excess level of xylanase (5,000 U/kg) had a tendency to induce the multiplication of E. coli and total aerobes. The results suggested that supplementing 500 U/kg and 1,000 U/kg xylanase was beneficial for broilers and excess xylanase supplementation resulted in no further improvement or negative effects.


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