Starch digestion in monogastrics: Mechanisms and opportunities

Gidley, M. J., Flanagan, B., Sharpe, K. and Sopade, P. A. (2011). Starch digestion in monogastrics: Mechanisms and opportunities. In: Pierre Cronjé, Recent Advances in Animal Nutrition - Australia. Symposium Proceedings 2011. Recent Advances in Animal Nutrition - Australia (RAAN, 2011), Armidale, NSW, Australia, (207-213). 13-15 July 2011.

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Name Description MIMEType Size Downloads
Author Gidley, M. J.
Flanagan, B.
Sharpe, K.
Sopade, P. A.
Title of paper Starch digestion in monogastrics: Mechanisms and opportunities
Conference name Recent Advances in Animal Nutrition - Australia (RAAN, 2011)
Conference location Armidale, NSW, Australia
Conference dates 13-15 July 2011
Proceedings title Recent Advances in Animal Nutrition - Australia. Symposium Proceedings 2011
Journal name Recent Advances in Animal Nutrition in Australia
Place of Publication Armidale, NSW, Australia
Publisher University of New England
Publication Year 2011
Year available 2011
Sub-type Fully published paper
ISBN 9781921597312
1921597313
ISSN 0819-4823
Editor Pierre Cronjé
Volume 18
Start page 207
End page 213
Total pages 7
Collection year 2012
Language eng
Formatted Abstract/Summary
As starch is the main energy source for animals fed grain-based diets, its rate and extent of digestion affects the efficiency of feed utilisation, feed intake and rate of gain. Characterisation by electron microscopy and solid state 13C NMR spectroscopy of undigested feed recovered from the ileum of pigs shows that some milled grain fragments can survive gastric and small intestinal digestion largely intact. In contrast, feeding of isolated (uncooked) maize starch granules results in essentially complete digestion by the mid-point of the small intestine. For milled grains, particle size is the dominant determinant of digestion rate in vitro, and the rate-determining step is proposed to be diffusion of α-amylase within the cellular structure of the endosperm. As the rate of granule digestion is much faster than the rate of enzyme diffusion through grain fragments of cereals used in animal feeds, starch gelatinisation per se is not required to increase ileal digestibility, even though starch gelatinisation is desirable for increasing α-amylase digestion rate. The beneficial effects of heat-moisture processing on grain digestibility in vivo may be due to the opening-up of grain structure, thereby reducing barriers to enzyme diffusion.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Presented during Session 8: "New Perspectives in Animal Nutrition". Published under "Invited Papers".

 
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Created: Wed, 01 Feb 2012, 18:58:44 EST by Dr Peter Sopade on behalf of Qld Alliance for Agriculture and Food Innovation