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Effect of Sodium Bicarbonate on Microbial Activity in the Rumen^1,2,3,

University of Georgia, Athens

Abstract

Sodium bicarbonate, incorporated in the drinking water of fistulated steers fed a pelleted complete ration, had a highly significant effect on the anaerobic counts in the rumen juice and on the regression of anaerobic counts with time. No significant regression of counts on water or feed consumption was observed but significant negative regressions of acetic, butyric, valeric acids and the sum of these plus propionic acid on water consumption occurred. There was no significant effect on the pH of the rumen juice, and no apparent effect in changing the predominant flora of the rumen as detected on TGYE media. The predominant organisms were found to be members of the genera, Ruminococcus, Lactobacillus, and Clostridium (anaerobic) and Bacillus, Micrococcus, and Ramibacterium (aerobic) with the latter being facultative.

¹ Journal Paper No. 224 of the College Experiment Station of the University of Georgia College of Agriculture Experiment Stations.

² Departments of Animal Husbandry and Food Technology.

³ Presented at the 53rd annual meeting of the American Society of Animal Production, Chicago, Illinois, November 24–25, 1961.

⁴ Present address: Department of Livestock, Payathai Road, Bangkok, Thailand.

⁵ We are grateful to A. E. Cullison for his suggestions, to J. L. Carmon far the statistical analyses and to Merck and Company, Rathway, New Jersey for supplying the sodium bicarbonate.