[en] Silage was prepared by alfalfa added with mixing bean curd refuse and brewers grains at various ratios. After irradiation of them, the effects on taste, chemical components and microflora were studied. When silage was prepared by alfalfa only and gamma ray irradiated, almost microorganism of silage were not indicated and lactic acid content in the materials decreased. If silage was prepared by brewers grains or bean curd refuse, change of microorganism number was same as alfalfa, but lactic acid content was large after storage. Increase of lipid peroxide by gamma ray irradiation was not observed. The gamma ray irradiation method made clear to be useful for production method of storage silage with high quality. (S.Y.)