Sergent D, Berbigier P, Kann G, Fevre J
Reprod Nutr Dev (1980). 1985;25(4A):629-40. doi: 10.1051/rnd:19850504.
Rectal temperature (RT), respiratory rhythm (RR), plasma cortisol and prolactin (PRL) levels and haematocrit were measured at noon in male Creole goats during their habituation to shade, during sudden exposure to sunlight and then while they were kept outdoors. Data on the microclimatic environment, especially black-globe temperature (Tg), were recorded. On the day (DO) the bucks were put in the sun, the increase of RT and RR, characteristic of circadian rhythm, was amplified (RT: 40.84 +/- 0,23 degrees C vs 39.48 +/- 0.19 degrees C P less than 0.001; RR: 98 +/- 22 vs 35 +/- 3 respirations/min; P less than 0.01). Plasma cortisol also increased (17.7 +/- 8.6 vs 5.57 +/- 1.7 ng/ml; P less than 0.05). After 24 h (D1), plasma prolactin concentration increased dramatically (923 +/- 653 vs 90 +/- 22 ng/ml; P less than 0.05) and haematocrit decreased (28.6 +/- 2.3 vs 33 +/- 2.3%; P less than 0.05). To clarify the simultaneous effects of time (t) and Tg, we developed a model Log-normal on t and linear on Tg for RR and PRL. A model decreasing exponentially with t and linear with Tg was developed for RT; the determination coefficients were R2 = 0.96, 0.75 and 0.59, respectively. About 3 weeks later, after the adaptation period, RT, RR and plasma PRL stabilized; RT and RR returned to shade values while the PRL level remained higher than the shade PRL level (248 +/- 109 vs 130 +/- 50 ng/ml; P less than 0.05). The 24-hour time-lag in prolactin hypersecretion and the role of prolactin in thermoregulation are discussed.
在雄性克里奥尔山羊适应阴凉环境、突然暴露于阳光下以及随后置于户外期间，于中午测量其直肠温度（RT）、呼吸节律（RR）、血浆皮质醇和催乳素（PRL）水平以及血细胞比容。记录了微气候环境数据，尤其是黑球温度（Tg）。在将公羊置于阳光下的当天（DO），昼夜节律特征性的RT和RR升高被放大（RT：40.84±0.23℃对39.48±0.19℃，P＜0.001；RR：98±22对35±3次呼吸/分钟；P＜0.01）。血浆皮质醇也升高（17.7±8.6对5.57±1.7 ng/ml；P＜0.05）。24小时后（D1），血浆催乳素浓度显著升高（923±653对90±22 ng/ml；P＜0.05），血细胞比容降低（28.6±2.3对33±2.3%；P＜0.05）。为阐明时间（t）和Tg的同时作用，我们针对RR和PRL建立了一个关于t的对数正态模型和一个关于Tg的线性模型。针对RT建立了一个随t指数下降且随Tg线性变化的模型；决定系数分别为R2 = 0.96、0.75和0.59。大约3周后，在适应期过后，RT、RR和血浆PRL趋于稳定；RT和RR恢复到阴凉环境下的值，而PRL水平仍高于阴凉环境下的PRL水平（248±109对130±50 ng/ml；P＜0.05）。讨论了催乳素分泌过多的24小时时间滞后以及催乳素在体温调节中的作用。
