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Effects of Different Levels of Supplementary Alpha-amylase on Digestive Enzyme Activities and Pancreatic Amylase mRNA Expression of Young Broilers

  • Jiang, Zhengyu (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Zhou, Yanmin (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Lu, Fuzeng (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Han, Zhaoyu (College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Wang, Tian (College of Animal Science and Technology, Nanjing Agricultural University)
  • Received : 2007.02.14
  • Accepted : 2007.05.20
  • Published : 2008.01.01

Abstract

Four hundred and forty 1-day-old Arbor Acre broilers were fed commercial starter diets with 0, 250, 750 and 2,250 mg/kg of an alpha-amylase preparation from 1 to 21 days of age to investigate the effects of an exogenous enzyme on growth performance, activities of digestive enzymes in the pancreas and anterior intestinal contents and pancreatic amylase mRNA expression. Body weight gain (BWG) and average daily gain (ADG) increased linearly (p<0.01) with increasing levels of supplementary amylase but feed conversion ratio (FCR) was not affected. There was a negative quadratic change of protease and amylase in the small intestinal contents with the increase of supplementary amylase level. The activity of intestinal trypsin was also increased (p<0.05). Lipase was unaffected by amylase supplementation (p>0.05). The pancreatic protease, trypsin, and lipase were not affected by exogenous amylase levels. Consistent with the tendency for a linear depression of amylase activity, pancreatic ${\alpha}$-amylase mRNA was down-regulated by dietary amylase supplementation. The present study suggested that oral administration of exogenous amylase affected activities of intestinal enzymes and the production of pancreatic digestive enzymes in a dose-dependent manner.

Keywords

Amylase;Broilers;Growth Performance;Enzyme Activity;mRNA

Acknowledgement

Supported by : National Science Foundation of China

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