The Lactobacillus and Bifidobacterium population in the feces of 26 animals (16 species) were studied by culture-dependent and culture-independent techniques. Lactobacilli were detected from a few herbivores, all carnivores and some omnivores. Lactobacillus johnsonii, Lactobacillus reuteri, Lactobacillus salivarius, Lactobacillus vaginalis and Lactobacillus ingluviei were the most dominant lactobacilli in carnivores. These species were, however, not predominant in herbivores and omnivores. Lactobacillus brevis, Lactobacillus casei, Lactobacillus parabuchneri, Lactobacillus plantarum, Lactobacillus sakei, Leuconostoc mesenteroides and Leuconostoc pseudomesenteroides, usually present in raw plant material, were present in omnivores but not in carnivores. Bifidobacteria were detected in only four herbivores and two omnivores. Bifidobacterium pseudolongum was the only Bifidobacterium species detected in herbivores. Bifidobacteria detected in the two omnivores are phylogenetically not closely related to known species and are possible novel species in the genus.
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