Where a standard dose of phytase is used to release phosphorous by breaking down plant phytate, and so allows a reduction in the added inorganic phosphorous in poultry diets, there appears to be little, if any, conflict between this mode of action and that for a xylanase. In fact, any failure to produce additional gains in this situation is most likely due to one or both enzymes being sub-optimal in terms of the characteristics needed for maximum efficacy.