J. Anim Sci.
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J. Anim Sci. 1982. 55:951-956.
© 1982 American Society of Animal Science
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Effects of Orotic Acid on in Vitro Volatile Fatty Acid Production by Sheep Rumen Fluid1

L. Bueno and P. Ralison

Ecole Nationale Vétérinaire2,,3, 31076 Toulouse Cédex, France

3 Address for reprint requests: Dr. L. Bueno, Dept. of Physiol, 23 Chemin des Capelles 31076 Toulouse Cedex, France.

Abstract

The influence of orotic acid on the production of VFA was investigated in vitro in two series of experiments with rumen fluid inoculum from four fistulated ewes fed a concentrate diet with (diet 2) or without (diet 1) urea. With rumen fluid inoculum from sheep fed diet 1 and a substrate consisting of a sample of diet 1, the addition of orotic acid to the fermentation flask significantly increased the rate of VFA production and the concentrations of propionic acid and total VFA dver those observed with the controls. When urea was included in the substrate, the addition of orotic acid significantly increased the rate of VFA production and the concentrations of acetic acid, propionic acid, longer chain VFA and total VFA. Orotic acid added to a fermentation flask containing rumen fluid inoculum from sheep fed diet 2 and a substrate consisting of a sample of diet 2 significantly increased the rate of VFA production and concentrations of butyric acid, higher VFA and total VFA over those observed in the controls in which only additional urea was included in the substrate. Overall, in vitro production of total VFA was lower when rumen fluid was taken from sheep fed diet 2. This appeared to be the result of depressed propionic acid production.

Footnotes

1 The authors thank Dr. H. W. Colvin for his helpful comments and criticism of the results and preparation of the manuscript.

2 Dept. de Physiol.






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Copyright © 1982 by the American Society of Animal Science.