Affiliation:
1. Western Regional Research Laboratory, Agricultural Research Service, U.S.Department of Agriculture, Berkeley, California 94710
Abstract
Rice straw was fermented with
Cellulomonas
sp. and
Alcaligenes faecalis
. Microbial cells and undigested residue, as well as chemically treated (NaOH or NH
4
OH) and untreated straws, were analyzed for nutrient composition and in vitro digestibility. In a typical fermentation, 75% of the rice straw substrate was digested, and 18.6% of the total substrate weight that disappeared was recovered as microbial protein. The microbial cell fraction was 37% protein and 5% crude fiber; the residue was 12% protein and 45% crude fiber. The microbial protein amino acid profile was similar to alfalfa, except for less cysteine. The microbial cells had more thiamine and less niacin than
Torula
yeast. In vitro digestibility of the microbial protein was 41.2 to 55%; that of cellulose was 52%.
Publisher
American Society for Microbiology
Subject
General Pharmacology, Toxicology and Pharmaceutics,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine
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