Thus, when chitosans are intended for use as feed additives, in which their purpose is not to inhibit
fermentationcompletely but to increase its efficiency, the concentration of chitosans in the diet appears
to be important for achieving positive effects on rumen fermentation. In addition, it can be hypothesised
that additive effects would depend on a wide range of factors, with the nature of the fermented
substrate being one of themost relevant (Weimer et al., 1999),