The invention relates to the use of at least one bacterial phytase in combination with one or more protease(s) in animal feed for improving weight gain and/or Feed Conversion Ratio (FCR) wherein the phytase is administered in one or more of the following amounts (dosage ranges): 1 000 FYT /kg feed 2 000 FYT /kg feed 3 000 FYT /kg feed and wherein the proteaseis administered in one of the following amounts (dosage ranges): 10 000 units/kg feed 11 000 12 000 13 000 14 000 15 000 16 000 17 000 18 000 19 000 20 000 units/kg feed.