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Evidence of endo toxins in the rumen bacteria of cattle fed hay or grain


Journal of Animal Science 47(1): 226-234
Evidence of endo toxins in the rumen bacteria of cattle fed hay or grain
The rumen bacterial fraction obtained from rumen fluids of cattle fed hay or grain was subjected to phenol-water or aqueous ether extraction procedures. The purified and lyophilized extract was endotoxic based on the following characteristics: proved lethal to mice and chick embryos, enhanced susceptibility to streptococcal infection in mice, induced biphasic fever and leukocyte response in rabbits, elicited local Schwartzman reaction in rabbits and caused (in nanogram quantities) gelation of Limulus lysate. Toxicity in mice was potentiated by actinomycin D. A parallel study with commercial endotoxins of Escherichia coli or Salmonella typhosa showed that these endotoxins were several times more toxic than those from rumen bacteria. This may be due to the presence of contaminating bacterial polysaccharides or to an inherently low endotoxicity of rumen bacteria.


Accession: 005411384

PMID: 361667



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