高温環境に暴露したアフリカピグミー山羊における各種ホルモン濃度の変動

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  • Hormonal Profiles of African Pygmy Goats Exposed to Heat Environment
  • コウオン カンキョウ ニ バクロシタ アフリカピグミー ヤギ ニ オケル カク

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Hormonal profiles were measured on 5 non-lactating African Pygmy goats exposed to thermoneutral and 3 levels of high temperature. Animals were progressively exposed to each environmental temperature (18°C for 5 days, 30°C for 3 days, 34°C for 9 days and 37°C for 4 days). Plasma prolactin concentration increased to a maximal during 37°C exposure, and epinephrine, norepinephrine and cortisol concentrations during 34°C exposure. Plasma epinephrine, norepinephrine and cortisol then tended to decline toward thermoneutral levels, which may be an expression of a state of acclimation. In this stage of acclimation phase, plasma prolactin remained elevated and T3 remained decreased.

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