屠殺前後の環境温度がラットの筋肉特性に及ぼす影響

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  • Effects of Environmental Temperature on Properties of Rat Muscle before and after Death
  • トサツ ゼンゴ ノ カンキョウ オンド ガ ラット ノ キンニク トクセイ ニ

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The induction of a PSE-like condition in rat muscle was attempted. The effect of ambient temperature ante-and post-mortem on muscle properties was also evaluated in rats to examine the importance of temperature regulation in preventing the development of PSE muscle. Male Sprague-Dawley rats were exposed to a warm environment at 43.0±0.5°C until the righting reflex was lost because of dyspnea and the rectal temperature rose above 43.0°C (90±23 min). Animals with and without the treatment were sacrificed by ether inhalation and held post-mortem at different ambient temperatures of 4, 25 and 35°C for 2.O hours, respectively. The time course of post-mortem changes in musculi quadratus lumborum were examined. The body temperat rose from 37.2±0.4 to 43.6±0.5°C during heat exposure. The post-mortem changes observed in the muscle of hyperthermic rats resembled those associated with the development of PSE muscle in the pig. That is, the decrease in the concentrations of glycogen and ATP, the increase in that of lactate and the fall in pH in m. quadratus lumborum occurred more rapidly in the rats exposed to heat than in untreated animals. Water holding capacity of the muscle decreased, and transmission values increased as a result of heat exposure. These changes in muscle parameters related to PSE were accelerated as post-mortem ambient temperature was raised. In the hyperthermic group, m. quadratus lumborum from the carcass kept at 35°C exhibited pale-colorand decreases in total pigments, hemoglobin and myoglobin. We concluded that a condition similar to porcine PSE muscle can be induced in m. quadratus lumborum of rats by exposing animals to a warm environment (43.0°C) for about 1.5 hour and keeping the carcass at 35°C for 1 hour. These findings indicate that even animals which possess no genetic stress-susceptibility develop PSE-like muscle by elevated body temperature before and after death.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 61 (5), 417-423, 1990

    公益社団法人 日本畜産学会

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