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Some effects of chloral hydrate on rumen fermentation and digestion in sheep

Published online by Cambridge University Press:  27 March 2009

J. C. Mathers  and
E. L. Miller
J. C. Mathers
Affiliation:
Department of Applied Biology, University of Cambridge, Pembroke Street, Cambridge, CB2 3DX
E. L. Miller
Affiliation:
Department of Applied Biology, University of Cambridge, Pembroke Street, Cambridge, CB2 3DX
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Summary

Two experiments were carried out with adult sheep to investigate the effects of chloral hydrate (CH) on rumen metabolism and on the sites and extent of digestion.

Experiment 1 confirmed that CH is a very potent methane inhibitor; doses of 1 or 4 g/day reduced methane production to 4% of that observed in the absence of the drug. In both experiments, CH administration altered the proportions of volatile fatty acids in rumen fluid. The main changes were an increase in propionic acid and a decrease in acetic acid with smaller increases in the proportion of isovaleric, valeric and caproic acids. Stoichiometric calculations indicated that only 21% of the hydrogen saved by prevention of methanogenesis was diverted to the synthesis of additional propionic and butyric acids and the fate of the remaining hydrogen was not determined unequivocally.

CH had little effect on the extent of biohydrogenation in the rumen of the long-chain fatty acids in dried grass.

The apparent digestibility of ether extract was reduced (P < 0·05) by CH but those of other proximate constituents and energy were little affected. There were no s gnificant effects of CH on the extent of digestion of dry matter, organic matter, non-ammonia nitrogen or ash between the mouth and abomasum, abomasum and terminal ileum or ileum and anus.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 99 , Issue 1 , August 1982 , pp. 215 - 224
Copyright
Copyright © Cambridge University Press 1982

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