Wasser S K
Department of Obstetrics and Gynecology, University of Washington, Seattle 98195, USA.
Biol Reprod. 1996 Aug;55(2):393-9. doi: 10.1095/biolreprod55.2.393.
Measurements of reproductive hormones (progestins and estrogens) excreted in feces were used to discriminate between 25 conceptive and 76 nonconceptive (including undetected early abortion) cycles of free-ranging yellow baboons at Mikumi National Park, Tanzania. Conceptive cycles had significantly higher luteal-phase progestin and estrogen concentrations than nonconceptive cycles as early as Day 4 postovulation. However, mean early luteal-phase progestin concentrations in conceptive cycles were lower when conception occurred during ecologically optimal vs. suboptimal times, and among females of high compared to low dominance rank. Mean estrogen concentrations in conceptive cycles showed the opposite dominance rank pattern: mean luteal-phase estrogen concentrations were higher in conceptive cycles of high-compared to low-ranking females. None of these relations existed for nonconceptive cycles. These data suggest that successful implantation is facilitated by relatively high early luteal-phase progestin and estrogen concentrations. However, long-term environmental cues predicting the probability of offspring survival appear to influence the amount of progesterone required for successful implantation; progesterone concentrations necessary to facilitate successful implantation are higher during suboptimal seasons or among females of low dominance rank-cues that also suggest that offspring survival conditions are relatively poor. This may act as a reproductive filter, restricting conception to females whose immediate condition (e.g., low social stress and good physical health) enables them to compensate physiologically and behaviorally for effects associated with these relatively harsh offspring survival conditions.
通过测量自由放养在坦桑尼亚米库米国家公园的黄狒狒粪便中排泄的生殖激素（孕激素和雌激素），来区分25个受孕周期和76个非受孕周期（包括未检测到的早期流产）。早在排卵后第4天，受孕周期的黄体期孕激素和雌激素浓度就显著高于非受孕周期。然而，当受孕发生在生态最优与次优时期时，以及在高等级与低等级雌性中，受孕周期的早期黄体期孕激素平均浓度较低。受孕周期中的雌激素平均浓度呈现相反的等级模式：高等级雌性的受孕周期中黄体期雌激素平均浓度高于低等级雌性。这些关系在非受孕周期中均不存在。这些数据表明，黄体期早期相对较高的孕激素和雌激素浓度有助于成功着床。然而，预测后代存活概率的长期环境线索似乎会影响成功着床所需的孕酮量；在次优季节或低等级雌性中，促进成功着床所需的孕酮浓度较高，这些线索也表明后代存活条件相对较差。这可能起到一种生殖筛选作用，将受孕限制在那些当前状况（如低社会压力和良好身体健康）使其能够在生理和行为上补偿与这些相对恶劣的后代存活条件相关影响的雌性身上。
