Probiotics and Prebiotics in Animal Health and Food Safety by Diana Di Gioia & Bruno Biavati

Author:Diana Di Gioia & Bruno Biavati
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5.5.1 Competitive Exclusion

The concept of competitive exclusion implies that cultures of selected, beneficial microorganisms, supplemented to the feed, compete with potentially harmful bacteria in terms of adhesion sites and organic substrates, mainly carbon and energy sources (Schneitz 2005). Probiotics may colonize and multiply in the gut, thereby blocking receptor sites and preventing the attachment of other bacteria including harmful species such as enteropathogenic Salmonella or E. coli.

Competitive exclusion of pathogens is thought to be one of the most important beneficial mechanisms of probiotic bacteria (Rolfe 2000), and it is based on bacteria-to-bacteria interaction mediated by competition for available nutrients and mucosal adhesion sites (Figs. 5.4 and 5.5) (Patterson and Burkholder 2003).

Fig. 5.4The beneficial bacteria when added to diet of poultry compete for binding sites on the intestinal epithelium

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