PURPOSE: To use a carrier for a feed component of protein, fats and oils, carbohydrates, etc., by grinding waste wood used for growing mushrooms from its skin part, such as Quercus acutissima, Quercus serrate, chinquapin, walnut tree, etc. after cultivation of mushrooms such as Cortinellus shiitake, Pleurotus ostreatus, etc.

CONSTITUTION: Waste wood used for growing mushrooms, such as Quercus acutissima, Quercus serrata, Quercus mongolica var. grosseserrata, Quercus diena, Platycarya strobilacea, Quercus variabilis Blume, oak, chinquapin, walnut, etc. after cultivation of Cortinellus shiitake, Pleurotus ostreatus, Pholiota nameko, etc. is ground by a grinder, and, if necessary, it is dried to ≤10wt% water content to give a carrier, on which feed of whisky residuary substances, residuary substances of soy sauce, fish oil, vitamin, mineral, amino acid, antibiotic, other feeds. Especially a matter obtained by supporting choline chloride on it is suitable as a feed for cattle.