Activities of enzymes of the pancreas, and the lumen and mucosa of the small intestine in growing broiler cockerels fed on tannin-containing diets

A. E. Ahmed, R. Smithard, M. Ellis

Research output: Contribution to journalArticlepeer-review

Abstract

Diets containing vegetable tannins, predominantly hydrolysable gallotannins, at levels of 135, 25 and 50 g/kg were fed to growing broiler cockerels to examine their effect on enzymes in the pancreas, the intestinal lumen and the intestinal mucosa. Pancreas weight per unit live weight showed a significant (P < 005) increase with increasing level of dietary tannin while that of the liver remained unaffected. Trypsin (EC 3.4.21.4) and a-amylase (EC 3.2.1.1) activities in the pancreas of birds fed at the highest level of tannins were more than double those from birds fed on a tannin-free control diet. In the intestinal lumen inhibition of trypsin activity increased with increasing level of dietary tannin; oc-amylase activity was inhibited at intermediate tannin levels but was restored at the highest level. Dipeptidase (EC 3.4.13.11) and sucrose oc-glucosidase (disaccharidase) (EC 3.2.1.48) in the intestinal mucosa were both inhibited by tannins. Growth of the birds and digestibility of nitrogen were adversely affected by the tannin-containing diets.

Original languageEnglish (US)
Pages (from-to)189-197
Number of pages9
JournalBritish Journal of Nutrition
Volume65
Issue number2
DOIs
StatePublished - Jan 1 1991
Externally publishedYes

Keywords

  • Brush border enzymes
  • Cockerel
  • Pancreatic enzymes
  • Tannin

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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