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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The digestion of fibre in herbivorous Anatidae - a review
Auteurs :	D. Durant, Auteur
Type de document :	Article
Dans :	Wildfowl (54 2003)
Article en page(s) :	7-24
Langues:	Anglais
Résumé :	Numerous studies on the ability of herbivorous Anatidae to digest fibre from a variety of food types (foliage, seeds, tubers) have yielded variable results. Herbivorous ducks and geese have the capacity to digest some components of fibre (between 0% and 85%, depending on the study and the fibre components analysed), in particular hemicellulose. Hemicellulose may be partially digested by acid hydrolysis early in the digestive tract, and the small particles of the fluid digesta obtained may undergo a limited fermentation in the caecae (with the aid of symbiotic microflora). Two sources of variation in the digestibility of fibre identified by the studies are discussed: experimental factors (in particular the differences in the method used) and biological factors. In the latter some of the variation in fibre digestibility reported by the studies is probably due to diet-based factors: differences in structural and chemical properties of the plant species consumed. But other factors, unrelated to diet, may be taken into account. Consumer-based factors, such as seasonal variation (in relation to the retention time of food in the gut) and differences in body mass or caecal length of the bird species, must also be considered. The use of fibre as a marker in studies of food digestibility in herbivorous Anatidae is discussed.

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