To provide a gizzard increase feed for domestic fowl, a mixture feed for gizzard increase for domestic fowl, and a method for increasing gizzard of domestic fowl including a new component which is effective for increasing gizzard of domestic fowls.SOLUTION: There are provided: a gizzard increase feed for domestic fowl comprising a sea squirt shell as an active principle； a mixture feed for gizzard increase for domestic fowl, including a sea squirt shell as an active principle for preparing the gizzard increase feed for domestic fowl； and a method for increasing gizzard of domestic fowl in which the sea squirt shell is supplied to the domestic fowls.SELECTED DRAWING: Figure 1【課題】家禽の筋胃の増大に有効な新たな成分を含む家禽の筋胃増大用飼料、家禽の筋胃増大用混合飼料、及び家禽の筋胃を増大させる方法を提供する。【解決手段】ホヤ殻を有効成分とする家禽の筋胃増大用飼料、前記家禽の筋胃増大用飼料を調製するためのホヤ殻を有効成分とする家禽の筋胃増大用混合飼料、及びホヤ殻を家禽に給与することを特徴とする家禽の筋胃を増大させる方法。【選択図】図１
