Relationships between Thermoregulatory Responses and Heat Loss in Cattles

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  • YAN Peishi
    Faculty of Applied Biological Science, Hiroshima University
  • ITO Toshio
    Faculty of Applied Biological Science, Hiroshima University

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  • 環境温度に対する育成牛の顕熱放散量と体温調節性生理反応との関係
  • カンキョウ オンド ニ タイスル イクセイギュウ ノ ケンネツ ホウサンリョウ ト タイオン チョウセツセイ セイリ ハンノウ ト ノ カンケイ

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For the management of thermal environment, the significance of the relationship between thermoregulatory responses, sensible heat loss were studied. Four female cattles were exposed to environmental temperatures (ET) of 5, 12, 19, 26, and 33°C daily for 8 hours. Heat production, vaginal temperature, tympanum temperature, skin temperature, heart rate, respiration rate and surface heat flux were measured. At 5-33°C, mean body temperature increased by 0.04°C for every 1°C ; respiration rate (RR) increased by 2.4/min. for every 1°C. Mean skin temperature (mTs) increased by 0.36 and 0.18 for every 1°C at 5-19 and 19-33°C, respectively. With an increase in ET, mean heat flux increased by 3.3W/m2 for every 1/min. rise in RR ; mean heat flux decreased by -14.4 and -50.8W/m2 for every 1°C rise in mTs at 5-19 and 19-33°C, respectively. Therefore, the change of mTs and RR was useful information which shows concrete effect from the complex thermal factor for environmental management.

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