TY - JOUR
T1 - Protein degradation by ruminal microorganisms from sheep fed dietary supplements of urea, casein, or albumin
AU - Wallace, R. J.
AU - Broderick, G. A.
AU - Brammall, M. L.
N1 - Medline is the source for the MeSH terms of this document.
PY - 1987/4
Y1 - 1987/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0023135297&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0023135297
SN - 0099-2240
VL - 53
SP - 751
EP - 753
JO - Applied and Environmental Microbiology
JF - Applied and Environmental Microbiology
IS - 4
ER -