Competition for cellulose among three predominant ruminal cellulolytic bacteria under substrate-excess and substrate-limited conditions

Article Abstract:

The rate and extent of adherence between cellulose particles and each strain of ruminal cellulolytic bacteria are important factors determining the outcome of the competition under substrate excess and limited conditions. Fibrobacter succinogens S85 and Ruminococcus flavefaciens fail to show any significant interaction during excessive substrate. The takeover of F. succinogens is accompanied by a shift in the relative ratio of acetate and succinate. The replacement by R. flavefaciens increases the extent of cellulose consumption and decreases the soluble sugars concentration.

Physiological aspects, Plant growing media, Ruminants

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Cellodextrin efflux by the cellulolytic ruminal bacterium Fibrobacter succinogenes and its potential role in the growth of nonadherent bacteria

Article Abstract:

Fibrobacter succinogenes contains cellobiose and cellodextrin phosphorylases which can both breakdown and form cellodextrins. The cellodextrins moves out of the F. succinogenes cells and is used by the cells of F. succinogens which are not attached to the cellulose and by the non-cellulose using bacteria like Streptococcus bovis. If the concentration of cellulose is less, most of the F. succinogenes cells are not attached to the cellulose and thus cellulse digestion depends on the cellulose concentration and not on the cellodextrin efflux.

Microbial enzymes

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Inhibition of ruminal cellulose fermentation by extracts of the perrenial legume cicer milkvetch (Astragalus cicer)

Article Abstract:

The relation of plant metabolites that inhibit the fermentation of plant structural polysaccharides to the variable digestibility of cicer milkvetch by ruminal microorganisms is discussed. Water extracted and unextracted cicer milkvetch neutral detergent fiber were fermented in vitro. Cellulose fermentation was inhibited by mixed ruminal microflora and ruminal cellulolyticbacteria. It was found that the presence of a water-soluble agent causes the inhibition of cicer milkvetch ruminal digestion.

Rumen fermentation, Astragalus (Plants), Astragalus (Plant)

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