中国石龙子繁殖季节血浆性类固醇激素水平的变化

本文研究了中国石龙子繁殖季节中性腺变化与血浆性类固醇激素水平波动间的相互关系。结果表明：雌性中国石龙子卵黄生成需要雌二醇(17β-estradiol,E2)的刺激。体现在卵巢重量于4月底至5月中旬间达峰值，血浆E2水平于3月底至最高值，此后显著回落，并于排卵前再次回升；血浆孕酮(progesterone，P)的生理功能在于输卵管卵的维持、促进胚胎发育和卵壳的形成。从3月中旬至4月底间，血浆P水平在基础值附近波动。5月中旬，随动物的排卵，血浆P水平迅速上升，至该月底达最高值，于产卵后迅速下降；E2随P的上升而下降，两者呈反向变动。雄性血浆睾酮(testosterone，T)水平与生精作用、维持攻击、求偶及交配行为密切相关。血浆T水平于动物出眠后呈现显著的上升趋势，并于4月中旬达峰值。5月中旬后，随睾丸的萎缩，血浆T水平也缓慢下降，至6月底达最低值。

Pattern of plasma sex steroid hormone levels during the breeding season of male and female skink: Eumeces chinensis]

Changes in gonadal activity and plasma sex steroid hormone levels in male and female Eumece chinensis during the breeding season were described. The results showed that: The vitellogensis of follicles of female Eumeces chinensis needed the stimulation of 17beta-estradiol (E2). As ovary masses reached peak values between late April and mid-May, E2 levels rose to the top value by late March, and then sharply declined but went up again before preovulation; The physiological functions of plasma progesterone (P) consisted in its oviductal egg retention, embryo development, and eggshell formation. P levels fluctuated near the basic value between mid-March and late April. In mid-May, with the onset of ovulation, plasma P levels rose rapidly, reached peak value by late May and declined sharply after ovulation. Plasma E2 levels declined as plasma P levels rose, showing an inverse relationship between them; In males, plasma Testosterone (T) levels were closely correlated with the maintenance of spermatogenesis activities, male and male combat, sexual display, and mating. Plasma T levels tended to rise after the termination of hibernation, and reached peak value by mid-April. After mid-May, with the testis aggressing, plasma T levels gradually went down and reached bottom value by late June.