Protein degradation by ruminal microorganisms from sheep fed dietary supplements of urea, casein, or albumin

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

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Ruminal fluid from sheep fed hay plus concentrate diets containing 1.8% urea, 6% casein, or 6% egg albumin had proteolytic activities of 4.12, 3.02, or 4.00 mg of [C] casein hydrolyzed ml h, respectively. Dietary albumin had no effect on the rate of albumin breakdown relative to that of casein (0.06). Greater numbers of highly proteolytic bacteria, mainly Butyrivibrio spp., were isolated from the rumens of sheep receiving albumin. Albumin hydrolysis by these isolates was even slower relative to that of casein (0.03) than in ruminal fluid and was similar to that found in isolates from urea- and casein-fed sheep. Hence, there appears to be no mechanism by which ruminal bacteria can alter their proteolytic activity to utilize resistant soluble protein more effectively.
Original languageEnglish
Pages (from-to)751-753
Number of pages3
JournalApplied and Environmental Microbiology
Volume53
Issue number4
Publication statusPublished - Apr 1987

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rumen microorganisms
Dietary Supplements
protein degradation
Caseins
sheep
Proteolysis
urea
albumins
dietary supplements
Urea
Albumins
casein
Sheep
microorganism
degradation
protein
rumen fluids
bacterium
fluid
hay

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Protein degradation by ruminal microorganisms from sheep fed dietary supplements of urea, casein, or albumin. / Wallace, R. J.; Broderick, G. A.; Brammall, M. L.

In: Applied and Environmental Microbiology, Vol. 53, No. 4, 04.1987, p. 751-753.

Research output: Contribution to journalArticle

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