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Lactobacillus cells in the rabbit digestive tract and the factors affecting their distribution.

Lactobacillus fermentum was present in small numbers in the caecum and colon of only one of 16 rabbits. Studies aimed at elucidating the factors affecting the colonization of lactobacilli in rabbit gut were thus performed. These studies included investigation of the effect of gastric juice and bile salts on the viability of lactobacilli, assay of the survival rates of lactobacilli in the gastrointestinal tracts of the rabbits with or without ileum cannulation and measurement of the adhesive capability of lactobacilli to the rabbit intestinal epithelial cells. Results showed that, although some lactobacilli were resistant to the rather low pH levels of rabbit gastric juice, lack of adhesive capability may prevent them from colonizing in the intestinal tract. Therefore, if lactobacilli are to be used as probiotics for rabbit, factors that affect their viability and ability to colonize should be considered.