Herremans M, Buyse J, Leenstra F R, Beuving G, Berghman L, Decuypere E
Laboratory for Physiology and Immunology of Domestic Animals, Heverlee, Belgium.
Reprod Nutr Dev. 1992;32(2):135-41. doi: 10.1051/rnd:19920206.
The aim of the present experiment was to study the growth hormone (GH) response upon thyrotropin releasing hormone (TRH) challenge (2 micrograms/kg body weight) in broiler chickens selected for body weight gain (GL line: fat line) or for feed efficiency (FC line: lean line) reared at either a moderate (33-23 degrees C) or high (33 degrees C) ambient temperature. A higher plasma GH level at 5 min after TRH administration was observed in the high temperature conditioned chickens of both lines. Also at high ambient temperature, an enhanced GH decrease between 15 min and 30 min post-injection and a higher acute elimination rate was calculated compared to moderate ambient temperature. A significantly higher GH secretory response was observed in the leaner FC line chickens, which was probably related to the more pronounced pulsatory GH secretion rate in these chickens. There was no difference in GH acute elimination rate between both lines in both environments. No interactions between line and rearing temperature for these parameters of GH dynamics were observed.
本实验的目的是研究在中等（33 - 23摄氏度）或高（33摄氏度）环境温度下饲养的、选用于体重增加（GL系：肥系）或饲料效率（FC系：瘦系）的肉鸡，在促甲状腺激素释放激素（TRH）激发试验（2微克/千克体重）后的生长激素（GH）反应。在两种品系的高温环境饲养的鸡中，TRH给药后5分钟时血浆GH水平较高。同样在高环境温度下，与中等环境温度相比，注射后15分钟至30分钟期间GH下降增强，且计算出更高的急性消除率。在较瘦的FC系鸡中观察到显著更高的GH分泌反应，这可能与这些鸡中更明显的GH脉冲分泌率有关。在两种环境下，两个品系之间的GH急性消除率没有差异。未观察到品系与饲养温度之间对于这些GH动态参数的相互作用。
