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 [14C]casein hydrolyzed ml-1 h-1, 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.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Wallace RJ,Broderick GA,Brammall MLdoi
10.1128/AEM.53.4.751-753.1987subject
Has Abstractpub_date
1987-04-01 00:00:00pages
751-3issue
4eissn
0099-2240issn
1098-5336journal_volume
53pub_type
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