Effects of Chlortetracycline Feeding on Bovine Rumen Microoraganisms

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Abstract
Manometric experiments of short duration were employed to measure the total fermentation products of rumen contents from chlortetra- cycline-fed and control animals, both in the presence and absence of additional chlortetracycline. Inhibition by added antibiotic was greater in the control animals, indicating that chlortetracycline feeding had altered the composition of the rumen microbial population. Methane production was diminished by the added chlortetracycline but this was probably a secondary result from inhibition in the production of the intermediates, hydrogen and formate. The potential for microbial activity in the rumen contents from chlortetracycline-fed steers was about the same as in the controls. The rumen micro-organisms appear to be somewhat more sensitive to chlortetracycline than to streptomycin. Copyright © . .