Microbial protein and peptide metabolism in rumen fluid from faunated and ciliate-free sheep

R. John Wallace, G. A. Broderick, M. L. Brammall

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Protease and deaminase activities and the metabolism of peptides were measured in rumen fluid from ciliate-free sheep and from sheep with a limited population of small entodinia. The same measurements were repeated following inoculation of the latter group with a more typical mixed ciliate population. Protease and dialanine uptake activities of mixed rumen micro-organisms were not significantly influenced by protozoa. Trialanine uptake, leucine aminopeptidase (EC, deaminase and trypsin-like protease activities were 70, 107, 73 and 91% higher with the limited population, and 72, 58, 64 and 55% higher when mixed protozoa were present, indicating a major role for the protozoa in these activities.
Original languageEnglish
Pages (from-to)87-93
Number of pages7
JournalBritish Journal of Nutrition
Issue number1
Publication statusPublished - Jul 1987


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