Abstract
Rice straw was fermented with Cellulomonas sp. and Alcaligenes faecalis. Microbial cells and undigested residue, as well as chemically treated (NaOH or NH4OH) 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%.
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Selected References
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- CAMPLING R. C., FREER M., BALCH C. C. Factors affecting the voluntary intake of food by cows. 3. The effect of urea on the voluntary intake of oat straw. Br J Nutr. 1962;16:115–124. doi: 10.1079/bjn19620013. [DOI] [PubMed] [Google Scholar]
- Guggolz J., Saunders R. M., Kohler G. O., Klopfenstein T. J. Enzymatic evaluation of processes for improving agricultural wastes for ruminant feeds. J Anim Sci. 1971 Jul;33(1):167–170. doi: 10.2527/jas1971.331167x. [DOI] [PubMed] [Google Scholar]
- Han Y. W., Callihan C. D. Cellulose fermentation: effect of substrate pretreatment on microbial growth. Appl Microbiol. 1974 Jan;27(1):159–165. doi: 10.1128/am.27.1.159-165.1974. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Han Y. W., Srinivasan V. R. Isolation and characterization of a cellulose-utilizing bacterium. Appl Microbiol. 1968 Aug;16(8):1140–1145. doi: 10.1128/am.16.8.1140-1145.1968. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Humfeld H. An Improved Laboratory-Scale Fermentor for Submerged Culture Investigations. J Bacteriol. 1947 Dec;54(6):689–696. doi: 10.1128/jb.54.6.689-696.1947. [DOI] [PMC free article] [PubMed] [Google Scholar]
- JUKES T. H. Assay of compounds with folic acid activity. Methods Biochem Anal. 1955;2:121–151. doi: 10.1002/9780470110188.ch5. [DOI] [PubMed] [Google Scholar]