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  • Title: Microbial protein and peptide metabolism in rumen fluid from faunated and ciliate-free sheep.
    Author: Wallace RJ, Broderick GA, Brammall ML.
    Journal: Br J Nutr; 1987 Jul; 58(1):87-93. PubMed ID: 3304417.
    Abstract:
    1. 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. 2. Protease and dialanine uptake activities of mixed rumen micro-organisms were not significantly influenced by protozoa. Trialanine uptake, leucine aminopeptidase (EC 3.4.11.1), 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.
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