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SUMMARY: Twenty-four representative isolates of cellulolytic cocci and ten of cellulolytic rods from the rumens of sheep fed differently supplemented teff hay diets were characterized. Nine of the coccal isolates could be classified as Ruminococcus albus and twelve as R. flavefaciens. Three were classified as a new variety of R. flavefaciens, R. flavefaciens var. lacticus, on the basis of the preponderance of lactic acid among the products of cellulose fermentation. Two of the isolates did not fit into any of these groups. The rods were identified as Butyrivibrio fibrisolvens. Tests for the presumptive identification of cellulolytic bacteria from the rumen are discussed.
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