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Article: Stimulatory and inhibitory effects of protein amino acids on growth rate and efficiency of mixed ruminal bacteria
- Article from:
- Journal of Dairy Science
- Article date:
- August 1, 2002
- Author:
CopyrightCopyright American Dairy Science Association Aug 2002. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
Mixed ruminal bacteria were incubated in vitro with glucose, xylose, cellobiose, and various protein amino acids replaced isonitrogenously with 25% (i.e., 25 mg of NIL) of ammonia-N, to determine the growth rate and the amount of sugar consumed in the exponential growth phase. The growth rate and efficiency (grams of bacteria per gram of sugars) increased by 46 and 15%, respectively, when a mixture of 20 amino acids was added. On the other hand, neither growth rate nor efficiency increased when any one of these amino acids was added singly, except for Glu and Gln, each of which produced significant but small improvements. The stimulatory effect of the combined amino acids on ...