We thank Dr. Yimin Cai (National Institute of Livestock and Grassland Science, Japan) for supplying the forage paddy rice and Ms. Junko Amagai for providing expert technical support. We also thank Novozymes Japan Ltd., Genencor International Inc., and Meiji Seika Kaisha, Ltd., for generously supplying the NS50013, GC220, and Acremonium cellulases, respectively. This work was supported by a government grant from the Ministry of Agriculture, Forestry and Fisheries, Japan (Grant number 19-1958).