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Russell JB, Baldwin RL. Comparison of maintenance energy expenditures and growth yields among several rumen bacteria grown on continuous culture. Appl Environ Microbiol. 1979;37(3):537-43doi: 10.1128/aem.37.3.537-543.1979.
Russell, J. B., & Baldwin, R. L. (1979). Comparison of maintenance energy expenditures and growth yields among several rumen bacteria grown on continuous culture. Applied and environmental microbiology, 37(3), 537-43. https://doi.org/10.1128/aem.37.3.537-543.1979
Russell, J B, and Baldwin, R L. "Comparison of maintenance energy expenditures and growth yields among several rumen bacteria grown on continuous culture." Applied and environmental microbiology vol. 37,3 (1979): 537-43. doi: https://doi.org/10.1128/aem.37.3.537-543.1979
Russell JB, Baldwin RL. Comparison of maintenance energy expenditures and growth yields among several rumen bacteria grown on continuous culture. Appl Environ Microbiol. 1979 Mar;37(3):537-43. doi: 10.1128/aem.37.3.537-543.1979. PMID: 16345359; PMCID: PMC243251.
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Appl Environ Microbiol. 1979 Mar;37(3):537-43. doi: 10.1128/aem.37.3.537-543.1979.

Comparison of maintenance energy expenditures and growth yields among several rumen bacteria grown on continuous culture.

Applied and environmental microbiology

J B Russell, R L Baldwin

Affiliations

  1. Department of Animal Science, University of California, Davis, Davis, California 95616.

PMID: 16345359 PMCID: PMC243251 DOI: 10.1128/aem.37.3.537-543.1979

Abstract

Maintenance energy expenditures were mesured for five rumen bacteria, Selenomonas ruminantium, Butyrivibrio fibrisolvens, Bacteroides ruminicola, Megasphaera elsdenii, and Streptococcus bovis, by using a complex medium with glucose as the carbon source. Large differences (as high as 8.5-fold) in maintenance energy expenditures were seen among these bacteria. The suggestion is made that maintenance requirements could be a significant determinant of bacterial competition in the rumen. Theoretical maximum growth yields, calculated from double reciprocal plots of yield versus dilution rate, were compared to theoretical Y(ATP) values in order to estimate minimum molar adenosine 5'-triphosphate yields from glucose for each bacterium. Results showed that relative yield among the bacteria was growth rate dependent. At high dilution rates, both S. ruminantium and S. bovis produced lactate as their principal fermentation product. At lower dilution rates very little lactate was formed and growth yields increased. Acetate and ethanol were the predominant fermentation products of S. bovis at low dilution rates. Other workers have shown that S. ruminantium produces acetate and propionate at low growth rates.

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