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The Effect of PH on Maximum Bacterial Growth Rate and its Possible Role as a Determinant of Bacterial Competition in the Rumen

The Effect of PH on Maximum Bacterial Growth Rate and its Possible Role as a Determinant of... Summary Five rumen bacteria were inoculated into media with pH values ranging from 6.7 to 4.7 to determine effects on maximum growth rate. Streptococcus bovis, Bacteroides ruminicola, and Selenomanas ruminantium appeared to be more resistant to low pH than either Butyrivibrio fibrisolvens or Megasphaera elsdenii. S. Bovis, B. ruminicola, and S. ruminantium showed gradual decreases in maximum growth rate as pH decreased while B. fibrisolvens and M. elsdenii showed an abrupt transition to no growth. Comparison of maximum growth rates among microbes at various pH's shows that ranking of growth rate between individual species can be pH dependent. The results suggest that pH can be a significant factor determining competition among bacteria in the rumen. This content is only available as a PDF. Author notes 1 Department of Animal Science. 2 Present address: Department of Animal Science, University of Illinois. Copyright 1979 by American Society of Animal Science. American Society of Animal Science http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Animal Science Oxford University Press

The Effect of PH on Maximum Bacterial Growth Rate and its Possible Role as a Determinant of Bacterial Competition in the Rumen

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References (8)

Copyright
Copyright 1979 by American Society of Animal Science.
ISSN
0021-8812
eISSN
1525-3163
DOI
10.2527/jas1979.482251x
Publisher site
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Abstract

Summary Five rumen bacteria were inoculated into media with pH values ranging from 6.7 to 4.7 to determine effects on maximum growth rate. Streptococcus bovis, Bacteroides ruminicola, and Selenomanas ruminantium appeared to be more resistant to low pH than either Butyrivibrio fibrisolvens or Megasphaera elsdenii. S. Bovis, B. ruminicola, and S. ruminantium showed gradual decreases in maximum growth rate as pH decreased while B. fibrisolvens and M. elsdenii showed an abrupt transition to no growth. Comparison of maximum growth rates among microbes at various pH's shows that ranking of growth rate between individual species can be pH dependent. The results suggest that pH can be a significant factor determining competition among bacteria in the rumen. This content is only available as a PDF. Author notes 1 Department of Animal Science. 2 Present address: Department of Animal Science, University of Illinois. Copyright 1979 by American Society of Animal Science. American Society of Animal Science

Journal

Journal of Animal Science – Oxford University Press

Published: Feb 1, 1979

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