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

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Abstract

夏季における放射熱が育成豚の生理反応,生産性に及ぼす影響を明らかにするために,体重約40kgのランドレース種去勢豚を用い,実験1では4頭で35日間,実験2では,6頭で21日間試験を行なった.両実験とも,30°Cに調整した環境調節室に全頭を収容し,中央に断熱板を設置して半数ずつ2群に分け,一方を対照区とした.他方には250Wの赤外線ヒーターを豚の直上からつるし,500kcal/m<sup>2</sup>•hrの放射熱を1日6時間照射し,これを照射区とした.豚はケージに収容し配合飼料を不断給餌した.<br>その結果,対照区の直腸温は39.8°C,照射区のそれは40.7°Cであり,1%水準で有意差が認められた.呼吸数は対照区が毎分110回,照射区は164回であり,5%水準で有意差が認められた.放射熱を照射された豚はpanting状態を示した.<br>日増体量は対照区が456g,照射区が386gであり,5%水準で有意差が認められた.飼料要求率は対照区が3.30,照射区が3.90であった.<br>以上の結果から,30°Cの暑熱環境は育成豚の生産性に悪影響を及ぼすが,これに放射熱が付加された場合,生産性が,いちじるしく低下することが認められた.

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/m<sup>2</sup>•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.

Journal

  • Nihon Chikusan Gakkaiho

    Nihon Chikusan Gakkaiho 55(6), 416-422, 1984

    Japanese Society of Animal Science

Cited by:  2

Codes

  • NII Article ID (NAID)
    130000737991
  • NII NACSIS-CAT ID (NCID)
    AN00195188
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1346-907X
  • NDL Article ID
    2988413
  • NDL Source Classification
    RB84(畜産--家畜--豚)
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-348
  • Data Source
    CJPref  NDL  J-STAGE 
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