歩行運動および採食負荷条件下における育成牛の熱産生量と心拍数との関係 Relationship between Heart Rate and Heat Production of Holstein Heifers During Eating and Walking

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ウシの熱産生量の心拍数に対する回帰式において,採食と運動という異なる負荷条件下でウシの熱産生量と心拍数を測定し,それぞれ回帰式を求め比較検討した.ホルスタイン種雌育成牛5頭を供試した.採食負荷については配合飼料を500gずつ3,000gまで給与し,運動負荷については,毎分6.7mから40mの異なる速度でトレッドミル上でウシを歩行させ,それぞれの条件下で熱産生量と心拍数を測定した.熱産生量の心拍数に対する回帰は,いずれの負荷の場合も有意であり,相関係数はいずれの個体についても運動負荷の場合が採食負荷の場合よりも高かった.熱産生量の心拍数に対する回帰式の回帰係数については,採食負荷と運動負荷の間で有意差は認められなかった.また,回帰定数にっいては,採食負荷と運動負荷の間で,2頭には有意差が認められなかったが,3頭には有意差が認められた.この結果,回帰係数は2つの負荷の間で併合できるものの,回帰直線については,その併合を確認できなかった.また,2つの負荷条件下において求めた回帰式より得られた推定値に無視できない大きさの差が生じた個体が存在した.これは採食負荷のかけ方にも原因があると考えられ,回帰式を求める際には実際の場面を想定した負荷をかける必要があると考えられた.

The relationship between heart rate and heat production of Holstein heifers was studied in two conditions. One was during exercise walking, and the other was during food intake. Five Holstein heifers were used in the study. In the walking exercise, heifers were walked on a treadmill at speeds of 6.7, 11.5, 16.7, 23.0, 30.0, and 40.0m/min. For increased levels of food intake, heifers were fed formula food in 500g increments until a total of 3, 000g had been consumed at intervals of 15 minutes. Heart rates were counted from E. C. G., and heat production was calculated from O2 consumption using a head chamber. All regression equations were significant, and correlation coefficient of walking exercise was higher than that of increased levels of food intake. As a result of covariance analysis, the equations obtained from walking exercise and from increased levels of food intake were identified in two heifers. In the other three heifers, regression coefficients were identified, but regression constants were not identified. Regression coefficients were identified between walking exercise and increased levels of food intake. In this experiment however, regression constants were not identified. This was due to the method of establishing food intake. When calculating regression equations between heart rate and heat production, it is necessary to ensure that rate of food intake is the same as in the field.

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 69(4), 387-391, 1998-04-25 

    Japanese Society of Animal Science

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各種コード

  • NII論文ID(NAID)
    10021726474
  • 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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