Microbial Ecology of Cell Wall Fermentation

@inproceedings{Dehority1993MicrobialEO,
  title={Microbial Ecology of Cell Wall Fermentation},
  author={B. A. Dehority},
  year={1993}
}
Effects of supplementation levels of Allium fistulosum L. extract on in vitro ruminal fermentation characteristics and methane emission
TLDR
Allium fistulosum extract had no apparent effect on ruminal fermentation characteristics or dry matter degradability, however, it reduced methane emission and methanogenic archaea abundance. Expand
Nutritive value of Trifolium pratense L. for ruminants estimated from in situ ruminal degradation of neutral detergent fibre and in vivo digestibility of organic matter and energy.
TLDR
Seven clover (Trifolium pratense L.) samples were collected at three different stages of the same sward during the growing season from 10th of May to 17th of August, and effective ruminal degradability of NDF generally decreased with the increasing date of cutting at each stage. Expand
Alterations in microbiota and fermentation products in equine large intestine in response to dietary variation and intestinal disease
TLDR
Assessment of monocarboxylic acids indicated that there are significantly higher concentrations of lactic acid in the colonic contents of horses maintained on a concentrate diet and those suffering from SCOD, correlating with the observed increase in the population abundance of the BLS group. Expand
In vivo 13C NMR study of glucose and cellobiose metabolism by four cellulolytic strains of the genus Fibrobacter
TLDR
Although genetically diverse, the Fibrobacter genus appears to possess a marked homogeneity in its carbon metabolism. Expand
The effect of selected rumen fauna on fibrolytic enzyme activities, bacterial mass, fibre disappearance and fermentation pattern in sheep
TLDR
It was calculated that 8-38% of the activity of CMC-ase and 14-49% of xylanase in the rumen originated from Eudiplodinium maggii, while a decrease in disappearance of DM, ADF and NDF was observed following the establishment of Dasytricha ruminantium in all three animals. Expand
Degradation of forage chicory by ruminal fibrolytic bacteria
TLDR
Determine the susceptibility of forage chicory to degradation by ruminal fibrolytic bacteria and measure the effects on cell‐wall pectic polysaccharides. Expand
Competition for cellobiose among three predominant ruminal cellulolytic bacteria under substrate-excess and substrate-limited conditions.
The ruminal cellulolytic bacteria Ruminococcus flavefaciens FD-1 and Fibrobacter succinogenes S85 coexisted in substrate-excess coculture with about equal population size, but R. flavefaciensExpand
Evaluation of Tannin Extracts, Leonardite and Tributyrin Supplementation on Diarrhoea Incidence and Gut Microbiota of Weaned Piglets
TLDR
It is suggested that the combination of tannin extracts, leonardite and tributyrin could improve animal health, thus reducing diarrhoea occurrence in weaned piglets and modulate the gut microbiota. Expand
Sheep Digestive Physiology and Constituents of Feeds
Sheep have a gastrointestinal tract similar to that of other ruminants. Their stomach is made up of four digestive organs: the rumen, the reticulum, the omasum and the abomasum. The rumen plays aExpand
Comparison of Productivity and Fecal Microbiotas of Sows in Commercial Farms
TLDR
Sow productivity in farms was likely associated with the compositions of the fecal microbiotas, including short-chain fatty acid-producing and fiber-degrading bacteria such as Ruminococcus, Fibrobacter and Butyricicoccus. Expand
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References

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The Rumen Protozoa
TLDR
In addition to the bacteria in the rumen there are many larger organisms which at various times have been designated protozoa, of which there are two groups both in the subclass Trichostomatia and the entodiniomorphs. Expand
Effects of microbial synergism on fibre digestion in the rumen.
  • B. A. Dehority
  • Chemistry, Medicine
  • The Proceedings of the Nutrition Society
  • 1991
TLDR
The primary sources of energy found in forages are the structural polysaccharides, cellulose, hemicellulose and pectin, and synergism between the various organisms can be important for the efficient use of forages by the ruminant animal. Expand
Digestion of Barley, Maize, and Wheat by Selected Species of Ruminal Bacteria
TLDR
Variation in the association between starch and protein within the endosperm of cereal grains contributes to the differential effectiveness with which amylolytic species can utilize cereal starch. Expand
Effect of Methanobrevibacter smithii on Xylanolytic Activity of Anaerobic Ruminal Fungi
TLDR
Both the rate and extent of xylan utilization were increased by coculturing, and metabolite profiles became acetogenic as a result of interspecies hydrogen transfer; more acetate and less lactate were formed, while formate and hydrogen did not accumulate. Expand
Estimating diet digestibility: a comparison of 11 techniques across six different diets fed to rams.
TLDR
Results suggest that caution should be exercised when using 11 techniques to estimate in vivo apparent DM digestibility, because no single technique provided accurate estimates across all diets and feeding conditions. Expand
Influence of hydrogen-consuming bacteria on cellulose degradation by anaerobic fungi
TLDR
The observed influence of the presence of methanogens is interpreted to indicate a shift of electrons from the formation of electron sink carbon products to H2 via reduced pyridine nucleotides, favoring the production of additional acetate and probably ATP. Expand
Recent advances in rumen microbial ecology and metabolism: potential impact on nutrient output.
TLDR
Three important areas of ruminal fermentation will be reviewed, N metabolism, fiber degradation, and biotransformation of toxic compounds, and opportunities for manipulation of rumen fermentation are good. Expand
Role of rumen fungi in fiber degradation.
TLDR
Data indicate that cocultures of anaerobic fungi with methanogenic bacteria stimulate cellulose degradation; other data suggest that fungi are inhibited by certain rumen microorganisms. Expand
Degradation and utilization of cellulose and straw by three different anaerobic fungi from the ovine rumen
TLDR
Three different ruminal fungi were grown anaerobically in liquid media which contained a suspension of either 1% purified cellulose or finely milled wheat straw as the source of fermentable carbon and biomass was estimated by using cell wall chitin or cellular protein in cellulose cultures and chit in straw cultures. Expand
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