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By anaerobic procedures, the total number of adherent bacteria was determined on tissue samples obtained from the roof of the dorsal rumen of three sheep. After four washings, 1.91 × 107 , 0.34 × 107 , and 1.23 × 107 bacteria per cm2 were still attached to the rumen epithelium in sheep 1, 2, and 3, respectively. A total of 95 strains of bacteria were isolated from these three samples. Based on morphology, Gram stain, anaerobiosis, motility, and fermentation end products, they were presumptively identified as follows:Butyrivibrio fibrisolvens , 30 strains; atypicalButyrivibrio , 5 strains;Bacteroides ruminicola , 22 strains;Lactobacillus , 1 strain; and unknownBacteroides species, 37 strains. For sheep 3, washing the rumen epithelium a total of 10 times reduced the adherent bacterial population by 93% (8.4 × 105 bacteria per cm2 ). Of 30 strains isolated from this sample, 22 were presumptively identified asButyrivibrio andBacteroides types. These results suggest that the epithelium on the roof of the dorsal rumen is primarily colonized by two genera of bacteria,Butyrivibrio andBacteroides . MostButyrivibrio andBacteroides ruminicola strains appeared to be similar to previously isolated rumen strains. However, the unknownBacteroides species differed considerably from the three species of this genus which are commonly isolated from rumen contents.

Bacterial Population Adherent to the Epithelium on the Roo of the Dorsal Rumen of Sheep