Edwards A, Jones S M
School of Zoology, University of Tasmania, Hobart, Tasmania, 7001, Australia.
Gen Comp Endocrinol. 2001 Jun;122(3):260-9. doi: 10.1006/gcen.2001.7634.
Changes in mean plasma concentrations of progesterone (P4), estrogen (E), and testosterone (T) in a captive population of female viviparous skinks, Tiliqua nigrolutea, were examined. Reproductively active and quiescent individuals were present in the population concurrently, allowing a comparison between these two conditions. Mean plasma progesterone concentrations were basal (1-2 ng ml(-1)) until the start of gestation and peaked in the second trimester (12.7 +/- 1.27 ng ml(-1)), before falling significantly prior to parturition. An increase in mean plasma estrogen concentrations occurred coincident with the vitellogenic period; the mean plasma estrogen concentration peaked at 715.1 +/- 106.68 pg ml(-1) shortly before ovulation. Mean plasma testosterone concentrations in reproductively active females peaked in the periovulatory period (6.3 +/- 0.63 ng ml(-1)) and had returned to basal concentrations (<1 ng ml(-1)) 2 weeks later. Changes in mean plasma steroid concentrations were correlated with reproductive condition and are discussed in terms of potential in vivo steroid interactions and the multihormone control of reproduction.
对圈养的胎生石龙子（Tiliqua nigrolutea）雌性群体中孕酮（P4）、雌激素（E）和睾酮（T）的平均血浆浓度变化进行了研究。该群体中同时存在生殖活跃和静止的个体，从而能够对这两种状态进行比较。平均血浆孕酮浓度在妊娠开始前处于基础水平（1 - 2 ng ml(-1)），在妊娠中期达到峰值（12.7 ± 1.27 ng ml(-1)），然后在分娩前显著下降。平均血浆雌激素浓度的增加与卵黄生成期同时发生；平均血浆雌激素浓度在排卵前不久达到峰值，为715.1 ± 106.68 pg ml(-1)。生殖活跃雌性的平均血浆睾酮浓度在排卵前期达到峰值（6.3 ± 0.63 ng ml(-1)），并在2周后恢复到基础浓度（<1 ng ml(-1)）。平均血浆类固醇浓度的变化与生殖状态相关，并从潜在的体内类固醇相互作用和生殖的多激素控制方面进行了讨论。
