Abstract
The body surface temperature of a Suffolk sheep placed outside under summer heat was measured using infrared radiation thermometer. The sheep was sheared only left side of the body. The surface temperature at the top of the head showed high temperature by exposing to the direct rays of the sun, indicating 62.5°C on 14 : 00 of August 1st (highest temperature ; 31.8°C). Simultaneously, the temperature at the top of the topline wool (wool length ; about 10 cm) indicated 44.5°C, while the temperature at the bottom of the topline wool was nearly body temperature.
The result indicates that the preparation of sunshade like shelter tree will be very important on grazing under summer heat because the surface temperature at the top of the head of Suffolk sheep covered with black short hair will become high temperature by exposing to the direct rays of the sun, and that wool has excellent insulating effect for summer heat.
