1. A method of manufacturing animal feed, including changing the molecular structure of biomass polysaccharides containing polysaccharides in the form of cellulose, hemicellulose or starch, by exposing the biomass to radiation at a dose of at least 5.0 Mrad, using an electron beam operating at a power of at least 5 kW , to obtain food material, including material having a number average molecular weight of from about 3,000 to 50,000 Daltons, having a protein or amino acid availability of nutrients exceed the availability of nutrients for the protein or amino acid of the biomass, while the availability of nutrients is determined by feeding equal amounts of the indicated food material and biomass to at least two different groups of one or more animals, and comparing the losses with the excrement of the protein or amino acid for these two groups； compaction of food material to obtain animal feed； and the provision of food material to an animal for consumption. 2. The method according to claim 1, characterized in that the animal is a person. The method according to claim 1, characterized in that the food material is a food material for use in agriculture. The method of claim 1, wherein the food material further comprises an enzyme. A method according to claim 1, characterized in that the electron beam has a power of at least 10 kW. A method according to claim 1, characterized in that the electron beam has a power of at least 20 kW. A method according to claim 1, characterized in that the electron beam has a power of at least 50 kW. The method according to claim 1, characterized in that the electron beam has1. Способ изготовления корма для животных, включающийизменение молекулярной структуры полисахаридов биомассы, содержащей полисахариды в форме целлюлозы, гемицеллюлозы или крахмала, путем воздействия на биомассу излучением дозой по меньшей мере 5,0 Мрад, используя пучок электронов, работающий при мощности по меньшей мере 5 кВт, для получения пищевого материала, включаю
