子豚の体温調節性生理反応の日内変化と飼料摂取量の影響 Diurnal Variation of Thermoregulatory Responses in Piglets under Fasting and Feeding

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子豚の体温調節性生理反応の日内変化と飼料摂取量の影響を調べ,ブタの体温の日リズムと体温調節の特徴について検討した.雌子豚4頭を用い,環境温度を25°C一定とし,絶食,維持量の2倍(2M)および3.2Mの給餌水準で,朝夕の摂食量を同一にして調べた.飼料摂取量の増加により,熱産生量,直腸温,末端部体表温,平均体表温および呼吸数のレベルは,いずれも増加ないし上昇した.これらの体温調節性生理反応は日リズムを示し,直腸温と呼吸数は,1:00-5:00で低く,13:00-17:00で高かった.末端部体表温と平均体表温は,逆に1:00-5:00で高く,13:00-17:00で低かった.このような呼吸数と平均体表温の日内変化は,体温の日リズムに応じ,熱収支が維持され,ブタの体温調節の特徴として注目された.

In order to obtain a better understanding of the characteristic of thermoregulation in piglets, variations in thermoregulatory responses were studied in four female piglets in a constant environmental temperature of 25°C where they received one of the three levels of feed at TDN level of 0, 60, 96g/kg<sup>0.75</sup> d. The daily feed was distributed in equal quantity at 0800h and 2000h to standardize heat production (HP) from feed ingestion. The influence of HP on rectal temperature (Tr), surface temperature (Ts) and respiration rate (RR) was clearly observed. The Tr and RR were greater during the 1300-1700h than during the 0100-0500h, and the difference of Tr was 0.3-0.8°C. The mean surface temperature (mTs) and Ts of tip sites such as ear tip, snout and pastern were greater during the 0100-0500h than during the 1300-1700h, and the difference of Ts of tip sites was 4-5°C. The contrast in the daily pattern of RR and mTs was conspicuous features. This may indicate that the increased sensible heat loss by mTs was to supplement heat balance with the decrease in evaporative heat loss of respiration during 0100-0500h.

収録刊行物

  • 日本畜産學會報 = The Japanese journal of zootechnical science  

    日本畜産學會報 = The Japanese journal of zootechnical science 71(10), J510-J515, 2000-10-25 

    Japanese Society of Animal Science

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各種コード

  • NII論文ID(NAID)
    10021719682
  • NII書誌ID(NCID)
    AN00195188
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1346907X
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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