The Influence of Thermal Radiation on Body Temperature, Cardiorespiratory Activity and Meat Productivity of Growing Pigs Kept at a Constant Temperature of 30°C

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  • 高温環境における放射熱が育成豚の生理反応および生産性に及ぼす影響
  • コウオン カンキョウ ニ オケル ホウシャ ネツ ガ イクセイ ブタ ノ セイ

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The influence of a radiant heat load upon growing pigs kept at a constant temperature of 30°C was studied using 30-40kg Landrace piglets fed ad libitum. Four piglets were used for Experiment I, and six for Experiment II. In each experiment, the piglets were divided into two groups; one group was kept at a constant temperature of 30°C as the control group, another at the same temperature but was subjected to a load of radiant heat (500kcal/m2•hr) using an infrared heater for 6 hours a day. The average rectal temperature of the control group was 39.8°C, while that of the radiated group was 40.7°C, showing a significantly higher temperature(P<0.01). The respiration rates for the two groups were 110 and 164, respectively (P<0.05). There was no significant difference in the heart rate between the two groups. Daily weight gains were poor in both groups, the latter being significantly poorer (P<0.05). The feed intake was similar in both groups. It was concluded that thermal radiation added to the environment at a constant temperature of 30°C did exert adverse effects upon growing pigs.

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