The changes in the levels of serum testosterone ( T), luteotropic hormone ( LH) and follicule stimulating hormone ( FSH) were studied in the pineal body removed SD male rats at the Winter Solstice and the Summer Solstice. 采用大鼠松果体摘除模型,探索了冬至、夏至SD雄性大鼠血清睾酮(T)、黄体生成素(LH)及卵泡刺激素(FSH)的变化规律。