Interbacterial adherence was frequently encountered among chicken lactobacilli. Fourteen of 45 combinations involving nine adhering strains were shown to be coaggregative. The coadherence mechanism was mediated by complementary heat- and sonication-sensitive cell surface structures. It was shown that intrageneric adherence enabled lactobacilli to maintain higher numbers in fed-batch reactors simulating the gastrointestinal tract. The mechanism of coaggregation can substantially increase the colonization potential of lactobacilli in environments with short residence times.
Lactobacilli play a distinctive role in the microbial balance of the chicken gut. In experiments simulating the chicken crop, the antagonism of lactobacilli against Enterobacteriaceae and Salmonella typhimurium was demonstrated and was attributed to lactic acid production. Moreover, adhesion to the crop epithelium was a common characteristic of intestinal lactobacilli. As opposed to salmonellas, lactobacilli were sensitive to deconjugated bile salts at 2.5MM. This sensitivity could lower their chance of proliferation in the small bowel of the chicken tract.
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