In this paper the authors described the result of their study on availability of the autoclaved castor pomace as an ingredient of broiler and layer rations. The pomace used in this study was that autoclaved 5 minutes at 125℃ under the pressure of 2 kg/cm^2, being composed of 2 preparations of different moisture contents ; i, e. one named A 5 including previously adjusted 15 % moisture, the other named AD 5 including approximately 10 % moisture without any adjustment. Both preparations were mixed into broiler and layer rations at 2.5 and 5 % levels. Although the crude extracts of both preparations did not indicate poisonous effect on 7 days old chickens by use of the intraperitoneal injection test, the preparation named A 5 was recognized superior to that named AD 5 according to the feeding experiments succeeded to the injection test, because some remarkable disturbance of egg production was observed in the group of pullets receiving the ration including AD 5 at 5 % level.