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Rates of production of volatile fatty acids in the rumen of grazing sheep and their relation to ruminal concentrations

Published online by Cambridge University Press:  09 March 2007

R. A. Leng ,
J. L. Corbett  and
D. J. Brett
R. A. Leng
Affiliation:
Department of Biochemistry and Nutrition, University of New England, Armidale, NSW 2351, Australia
J. L. Corbett
Affiliation:
CSIRO, Pastoral Research Laboratory, Armidale, NSW 2351, Australia
D. J. Brett
Affiliation:
CSIRO, Pastoral Research Laboratory, Armidale, NSW 2351, Australia
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Abstract

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1. The rates of production, or entry rates, of acetic, propionic and butyric acids in the rumen of grazing sheep have been measured by a radioisotope technique previously used on penned animals.

2. Regression equations were derived relating entry rates to ruminal concentrations. The equations from penned and grazing sheep did not differ significantly.

3. The standard errors of entry rates predicted for a single sheep from equations based on all results were calculated to be ± 0·06, 0·18 and 0·15 m-mole/min for acetic, propionic and butyric acids respectively.

4. Interconversions between acetic and butyric acids in the rumen were similar in extent to those found in penned sheep. These values were used to calculate from entry rates the net amounts of the acids becoming available to the animals.

5. An equation was derived that permits the amount of energy supplied to an animal by the acids to be predicted from concentrations with a standard error of ± 0·17 kcal/min.

6. The applicability of the prediction equations is discussed.

Type
Research Article
Information
British Journal of Nutrition , Volume 22 , Issue 1 , February 1968 , pp. 57 - 68
Copyright
Copyright © The Nutrition Society 1968

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