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The fate of water in the rumen

1. A critical appraisal of the use of soluble markers

Published online by Cambridge University Press:  09 March 2007

A. C. I. Warner  and
B. D. Stacy
A. C. I. Warner
Affiliation:
CSIRO, Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, NSW, Australia
B. D. Stacy
Affiliation:
CSIRO, Division of Animal Physiology, Ian Clunies Ross Animal Research Laboratory, Prospect, NSW, Australia
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Abstract

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1. A mathematical treatment is given of the marker technique for studying water balances in the rumen. The treatment is extended to cover non-steady-state conditions and emphasis is placed on the underlying assumptions and practical limitations of the technique.

2. The 51Cr complex of ethylenediamine tetra-acetic acid (51Cr EDTA) was used as a marker in the rumen of sheep.

3. The 51Cr EDTA entered 95–98% of the water in the rumen. Mixing in the rumen, though adequate, was usually not quite complete even 1·5 h after injection of the dose. The techniques of injecting the dose and of withdrawing the sample were found to be important; some techniques often led to poor mixing.

4. Provided that the time of injection of the dose was suitably selected, reliable estimates of the volume of water in the rumen could readily be made, but reliable estimates of flow rates needed stringent attention to details of technique.

Type
Research Article
Information
British Journal of Nutrition , Volume 22 , Issue 3 , September 1968 , pp. 369 - 387
Copyright
Copyright © The Nutrition Society 1968

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