DePalatis L, Moore J, Falvo R E
J Reprod Fertil. 1978 Mar;52(2):201-7. doi: 10.1530/jrf.0.0520201.
Blood samples were withdrawn every 20 min from 3 conscious intact and 2 castrated mature males during non-consecutive periods of 12 h during the light and dark phases of the lighting schedule (intact dogs) and of 11 h during the light period (castrated dogs). In the intact dogs testosterone concentrations ranged from 0.4 to 6.0 ng/ml over the 24-h period. LH concentrations varied from 0.2 to 12.0 ng/ml. In all animals, LH peaks were clearly followed, after about 50 min, by corresponding testosterone peaks, but no diurnal rhythm could be established. LH concentrations in the castrated dogs were high (9.8 +/- 2.7 (s.e.m.) ng/ml), and still showed an episodic pattern in spite of the undetectable plasma testosterone levels.
在光照周期的明期和暗期（未阉割犬）的非连续12小时期间以及明期的11小时期间（阉割犬），每隔20分钟从3只清醒完整的和2只阉割成熟雄性犬采集血样。在未阉割犬中，24小时内睾酮浓度范围为0.4至6.0 ng/ml。促黄体生成素（LH）浓度在0.2至12.0 ng/ml之间变化。在所有动物中，LH峰值出现后约50分钟，紧接着出现相应的睾酮峰值，但未发现昼夜节律。阉割犬的LH浓度较高（9.8±2.7（标准误）ng/ml），尽管血浆睾酮水平检测不到，但仍表现出间歇性模式。
