Caecal protein fermentation in broilers: a review

SUMMARYProtein fermentation (PF) is the degradation of protein by microbiota in gastro-intestinal tract. It results from high intake indigestible and/or increased endogenous losses, and it may be cause gut health issues. This important as use less digestible sources for poultry expected to increase a consequence food-feed discussion. Here we review relations between dietary protein, caecal PF identify critical knowledge gaps. Finally, suggest methods investigation PF. The majority microorganisms have never been cultured, however, through cultivation-independent molecular approaches, many new taxa identified. Researchers identified that are enriched healthy/ unhealthy birds. mechanisms underlying these associations remain unclear. production potentially detrimental metabolites. generally higher pH, further encouraging Studies on effects (metabolites) limiting. For vivo evaluation an flow into caeca required, which can result level protein. Heat damage reduces digestibility therefore used create within ingredient contrast studies. A remaining challenge relation subsequent not straightforward, fractional separation digesta occurs poultry, allowing part bypass caeca. To study extent will ferment fraction flowing caeca, vitro studies applied. However, their application depends ability separate pre-digested feed likely enter Altogether, affect composition, metabolite production, health.