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Effect of ruminal infusion of acetic acid and sodium acetate on the concentrations of ciliate protozoa

Published online by Cambridge University Press:  27 March 2009

B. E. A. Borhami ,
K. El-Shazly  and
A. R. Abou Akkada
B. E. A. Borhami
Affiliation:
Department of Animal Production, Faculty of Agriculture, University of Alexandria, Egypt, U.A.R.
K. El-Shazly
Affiliation:
Department of Animal Production, Faculty of Agriculture, University of Alexandria, Egypt, U.A.R.
A. R. Abou Akkada
Affiliation:
Department of Animal Production, Faculty of Agriculture, University of Alexandria, Egypt, U.A.R.
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Summary

Two fistulated rams were infused through the rumen cannulae with acetic acid or sodium acetate for 4 consecutive days. This infusion has caused a significant drop in the daily feed intake and in the concentrations of rumen ciliate protozoa. The holotrich protozoa were the most susceptible, whereas entodinia were the least sensitive, to the reducing effect of acetic acid or sodium acetate. Decreasing the daily feed intake by 30% has caused little or no change in the concentrations of rumen ciliate protozoa. The in vitro incubation of sodium acetate and rumen contents has resulted in a remarkable depression in the protozoal numbers. Most of this decrease occurred after 5 h of incubation. The addition of acetic acid or sodium acetate to washed suspensions of mixed populations of rumen ciliate protozoa has decreased the in vitro volatile fatty acid production. It is suggested that both the low pH and acetate, ion were responsible for the reduction in the protozoal numbers in the rumen of rams infused with acetic acid or sodium acetate. The effect of acetate on the ciliate protozoa could be an explanation of the diurnal changes in the concentrations of various protozoal groups usually observed in the rumen of the host animal.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 78 , Issue 2 , April 1972 , pp. 239 - 244
Copyright
Copyright © Cambridge University Press 1972

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