Taylor G T, Weiss J, Rupich R
Physiol Behav. 1985 Nov;35(5):735-9. doi: 10.1016/0031-9384(85)90404-4.
Circulating titers of testicular and gonadotrophic hormones differ widely among conspecific mammalain males. The behavioral and physiological consequences of these differences were examined by injecting gonadally intact male rats with extra testosterone or an antiandrogen. Serum testosterone values increased and decreased, respectively, relative to control animals, although all values remained within normal physiological ranges. Results suggested that hormone-sensitive behavior and physiology were related to suprathreshold androgen differences in a dose-response fashion among virgin males. The relationship was more complex among sexually experienced males. Additional testosterone to the experienced males increased the frequency of both aggressive and sexual responding as well as the activity of sex accessory glands. Reductions of circulating testosterone, however, had minimal effects on behavior despite substantial atrophy of hormone-sensitive tissues. Indeed, fecundity was independent of hormone therapy as all experienced males successfully fathered pups. Suprathreshold hormone differences in natural populations of males may reflect sexual selection that is maintained by female choice of a mate.
在同种雄性哺乳动物中，睾丸激素和促性腺激素的循环滴度差异很大。通过给性腺完整的雄性大鼠注射额外的睾酮或抗雄激素，研究了这些差异的行为和生理后果。与对照动物相比，血清睾酮值分别升高和降低，尽管所有值都保持在正常生理范围内。结果表明，在未交配的雄性中，激素敏感行为和生理与超阈值雄激素差异呈剂量反应关系。在有性经验的雄性中，这种关系更为复杂。给有经验的雄性额外注射睾酮会增加攻击性行为和性行为的频率，以及性附属腺的活性。然而，尽管激素敏感组织大量萎缩，但循环睾酮的降低对行为的影响最小。事实上，生育能力与激素治疗无关，因为所有有经验的雄性都成功地使母鼠受孕产仔。雄性自然种群中超阈值激素差异可能反映了由雌性选择配偶所维持的性选择。
