Patent ID: 7217433

Claim:
An animal feed composition, comprising (a) a xylanase of Family 11 glycosyl hydrolase having a pH-optimum in the range of 4.5–7.5 and a residual xylanase activity after incubation for 60 minutes at pH 6.0 of one or more of: more than 96% residual activity when measured at 60° C.; more than 83% residual activity when measured at 65° C.; more than 20% residual activity when measured at 70° C.; and more than 10% residual activity when measured at 75° C., wherein the xylanase comprises an amino acid sequence having at least 95% identity to the amino acid sequence of SEQ ID NO: 2; and (b) a cereal which comprises wheat and/or rye in an amount between 50 and 73.10 weight % of the feed composition; wherein the animal feed composition is for feeding a chick or poultry and the xylanase improves the growth rate and/or feed conversion ratio of the chick or poultry.