1. An animal feed selected from the group consisting of silage, granular food and a blender, wherein said animal food is supplemented with a xylanase-containing composition, wherein said xylanase is hyperthermophilic and hyperthermostable, where the optimum xylanolytic activity temperature of said composition is greater than 80 ° C, where more than 70% of the xylanolytic activity of the specified composition is resistant to 30 minutes of heating at 90 ° C, and where the ratio of the xylanolytic activity of the specified composition at optim at 40 ° С it is more than 10.2. Animal feed according to claim 1, wherein the optimum xylanolytic activity temperature of said composition is greater than 85 ° C, preferably greater than 90 ° C. The animal feed according to claim 1 or 2, wherein the xylanolytic activity ratio of said composition at an optimum temperature and at 40 ° C. is more than 20.4. An animal feed according to claim 1, wherein the xylanase activity of said composition is measured using 3% w / v% xylan, preferably using 3% w / v% xylan birch wood as a substrate. An animal feed according to claim 1, wherein the xylanase activity of said composition is measured after a 15 minute reaction. The animal feed according to claim 1, wherein the hyperthermophilic and hyperthermostable xylanase has more than 80% identity and / or 95% similarity to xylanase selected from the group consisting of SEQ.ID.NO:1, SEQ.ID.NO:2, Amino acids 21-332 in SEQ.ID.NO:1, in SEQ.ID.NO:2, in SEQ.ID .NO: 3, in SEQ.ID.NO:4 and in SEQ.ID.NO► Animal feed according to claim 1, wherein the hyperthermophilic and hyperthermostable xylanase possesses more than 99%1. Корм для животных, выбранный из группы, состоящей из силоса, гранулированного корма и мешанки, где указанный корм для животных дополнен композицией, содержащей ксиланазу, где указанная ксиланаза является гипертермофильной и гипертермостабильной, где оптимальная температура ксиланолитической активности указанной композиции составляет бол
