Abstract
Pure cultures of strains of different species of rumen bacteria were grown in filter-sterilized rumen fluid supplemented with glucose, bicarbonate, and reducing agent (cysteine and sulfide). Growth rates were determined in a series of experiments. Strains of species most abundant in the rumen grew more rapidly than strains of less abundant bacteria. Ammonia, amino acids, and peptides increased growth rates to some extent, but the greatest stimulatory effect for less abundant bacteria was provided by other factors, present in yeast extract. Factors released from lysates of mixed rumen microbes stimulated growth, but their rate of release was slow. It was concluded that, besides energy and nitrogen sources, growth factors of an as-yet-undetermined nature probably play an important role in determining the predominance of different bacterial species in the rumen.
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Selected References
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- Bryant M. P. Nutritional features and ecology of predominant anaerobic bacteria of the intestinal tract. Am J Clin Nutr. 1974 Nov;27(11):1313–1319. doi: 10.1093/ajcn/27.11.1313. [DOI] [PubMed] [Google Scholar]
- Hespell R. B. Efficiency of growth by ruminal bacteria. Fed Proc. 1979 Dec;38(13):2707–2712. [PubMed] [Google Scholar]