Although the importance of dietary fibers to contribute to the nutrient supply in chickens is rather limited, fibers may interfere with the digestion of other nutrients through their effects on physicochemical properties of the digesta, thereby influencing nutrient accessibility, bulking properties, microbial activity, gut physiology and function, endogenous secretions, and flow of digesta through the GIT. Recent literature highlights the importance of dietary fibers for the regulation of digesta flow in the upper digestive tract, mainly through a prolonged retention of digesta in the gizzard. Furthermore, fiber may also be important for the regulation of digesta transit in other GIT segments. High fiber diets promote the separation of solid and liquid digesta and the amount of fiber directed to the ceca, seems to be influenced by fiber properties, as particle size and solubility.
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