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Site and extent of starch degradation in the dairy cow. A comparison between in vitro, in situ and in vivo measurements

Published online by Cambridge University Press:  20 November 2017

J.W. Cone ,
V.A. Hindle  and
A.M. van Vuuren
J.W. Cone*
Affiliation:
Nutrition and Food, Animal Sciences group of WUR, P.O. box 65, NL-8200 AB Lelystad, The Netherlands.
V.A. Hindle
Affiliation:
Nutrition and Food, Animal Sciences group of WUR, P.O. box 65, NL-8200 AB Lelystad, The Netherlands.
A.M. van Vuuren
Affiliation:
Nutrition and Food, Animal Sciences group of WUR, P.O. box 65, NL-8200 AB Lelystad, The Netherlands.
*
E-mail: [email protected].
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Extract

Starch digestion in the rumen and large intestine yields volatile fatty acids that are either ketogenic (acetate, butyrate) or glycogenic (propionate) precursors, whereas starch digestion in the small intestine yields mainly glycogenic precursors. Therefore, supply of ketogenic and glycogenic precursors from starch is related to the site of digestion. In this study the site of digestion of starch from wheat, maize and potato was estimated by in vitro methods, i.e. the gas production technique and an enzymatic technique, and the nylon bag technique. The in vitro and in situ results were validated by in vivo experiments with dairy cows, determining the site and extent of starch degradation.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2004 , 2004 , pp. 166
Copyright
Copyright © The British Society of Animal Science 2004

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References

Cone, J.W., Van Gelder, A.H., Visscher, G.J.W. and Oudshoorn, L. 1996. Influence of rumen fluid and substrate concentration on fermentation kinetics measured with a fully automated time related gas production apparatus. Animal Feed Science and Technology 61: 113–128.Google Scholar
Cone, J.W. 1991. Degradation of starch in feed concentrates by enzymes, rumen fluid and rumen enzymes. Journal of the Science of Food and Agriculture 54: 23–34.Google Scholar