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Dr Sophie Réhault-Godbert - The eggshell microbiome
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Descriptif
Avian eggspossess very efficient and orchestrated systems to protect the embryo duringincubation, until hatch. Although the internal components of the egg areassumed to be sterile, the surface of the eggshell is covered by microbes(essentially bacteria) that may contribute to prevent eggshell colonization bypathogenic bacteria, through direct inhibition and/or competitive exclusion.The composition of the eggshell microbiome is a heritage from both maternalmicrobiota (caeca/faeces) where the egg meets caecal secretions in the cloacalsegment during oviposition, and from the nesting environment (contaminatedlitter/feathers and air environment including dust). At laying time, the eggsurface is still moisturized, but will progressively dehydrate duringincubation. The surface characteristics of the egg, the loss of the moisturelayer and the presence of antimicrobial molecules composing the cuticle arelikely to dictate the bacterial communities that will survive on the surface ofthe eggshell. Although the literature on the composition of the eggshellmicrobiome of eggs originating from current commercial chicken hens is quitesporadic, this talk aims to provide an overview of the bacterial communitiesthat colonize the chicken eggshell surface, and will discuss the role of theeggshell microbiota as the first barrier against pathogenic bacteria.
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