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The utilization of gelled maize starch in the small intestine of sheep

Published online by Cambridge University Press:  09 March 2007

R. W. Mayes  and
E. R. Ørskov
R. W. Mayes
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
E. R. Ørskov
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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1. A solution of gelled maize starch and Cr-EDTA was continuously infused for 4 weeks via the abomasum into sheep of different ages. The proportions of infused α-glucoside passing the terminal ileum as glucan (ethanol-precipitable α-glucoside), dextrins (ethanol-soluble glucose polymers) and glucose, and the glucan and over-all α-glucoside disappearances in the small intestine were determined. Ethanol-soluble α-glucoside compounds in ileal digesta were further separated by paper chromatography.

2. Glucan was efficiently degraded, since little reached the terminal ileum. Most of the α-glucoside in ileal digesta consisted of glucose and dextrins (mainly short chain length oligosaccharides), suggesting that α-amylase activity was not limiting over-all starch utilization.

3. No adaptation of intestinal starch utilization was evident except that the proportion of infused α-glucoside passing the terminal ileum as glucose decreased with time.

4. A negative correlation existed between the pH and the total α-glucoside content of the ileal digesta, possibly relating to changes in the microbial activity.

5. The advantages and disadvantages of feeding with starch so as to by-pass rumen fermentation are discussed.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 32 , Issue 1 , July 1974 , pp. 143 - 153
Copyright
Copyright © The Nutrition Society 1974

References

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