Document Detail

Increased small intestinal fermentation is partly responsible for the anti-nutritive activity of non-starch polysaccharides in chickens.
MedLine Citation:
PMID:  8842468     Owner:  NLM     Status:  MEDLINE    
1. The mechanism of the anti-nutritive activities of soluble non-starch polysaccharides (NSPs) in broiler diets was investigated with emphasis on the inter-relationship between viscosity and fermentation along the gut. Isolated soluble NSP were added to a control diet to effect high gut viscosity, and in vivo depolymerisation of the NSP was achieved using a commercial glycanase. 2. Addition of soluble NSPs significantly (P < 0.01) increased gut viscosity, reduced the AME of the diet and depressed the growth and FCE of the birds. Enzyme supplementation of the NSP-enriched diet reversed the adverse effects, increasing (P < 0.01) weight gain, FCE and AME. Comparisons of the viscosities (mPa) in birds fed on the NSP-enriched diet and the same diet supplemented with enzyme were respectively: 11.9 v. 2.3 in the duodenum; 78.3 v. 4.4 in the jejunum and 409.3 v. 10.8 in the ileum. 3. Caecal volatile fatty acid concentration was markedly (P < 0.01) elevated by enzyme supplementation, whereas ileal fermentation was inhibited. 4. Microscopic examination revealed that, among birds fed on the NSP-enriched diet, there had been extensive small intestinal fermentation, which was eliminated by the enzyme supplementation. 5. Addition of a synthetic antibiotic (Amoxil) had no beneficial effects. 6. The current study demonstrated that increased fermentation occurs in the small intestine when a large amount of viscous NSPs is present in the diet and this is detrimental to the performance and well-being of poultry.
M Choct; R J Hughes; J Wang; M R Bedford; A J Morgan; G Annison
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British poultry science     Volume:  37     ISSN:  0007-1668     ISO Abbreviation:  Br. Poult. Sci.     Publication Date:  1996 Jul 
Date Detail:
Created Date:  1997-01-06     Completed Date:  1997-01-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  15740290R     Medline TA:  Br Poult Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  609-21     Citation Subset:  IM    
CSIRO Division of Human Nutrition, Glenthorne Laboratory, Australia.
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MeSH Terms
Animal Feed*
Energy Intake
Fatty Acids, Volatile / analysis
Food, Fortified*
Glycoside Hydrolases*
Intestinal Mucosa / physiology*
Intestine, Small / physiology*
Nutritive Value
Polysaccharides / metabolism*
Reg. No./Substance:
0/Fatty Acids, Volatile; 0/Polysaccharides; 9005-25-8/Starch; EC 3.2.1.-/Glycoside Hydrolases; EC 3.2.1.-/glycanase

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