J. Anim Sci.
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J. Anim Sci. 1966. 25:609-612.
© 1966 American Society of Animal Science
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Influence of Rumen Protozoa and Bacteria upon Cellulose Digestion In Vitro1

R. D. Yoder, Allen Trenkle and Wise Burroughs

Iowa State University, Ames

Abstract

The addition of washed rumen protozoa to a washed suspension of rumen bacteria substantially increased cellulose digestion and acid production. The molar proportion of acetic acid was decreased, and butyric acid increased when both types of microorganisms were present. About 70% of the stimulatory activity of protozoa upon cellulose digestion by rumen bacteria was retained following autoclaving of the protozoa. Additions of protozoa increased cellulose digestion by rumen bacteria cultured in vitro in the presence of added volatile acids, a combination of vitamins B12 and biotin or acid hydrolyzed casein.

Footnotes

1 Journal Paper No. J-5101 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 1526, contributing project to Regional Research Project NC 63.






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Copyright © 1966 by the American Society of Animal Science.