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多元性有利于雄性大鼠的同性伴侣偏好
Alejandra Hernández1, Kurt Hoffman2, Rebeca Reyes1
1Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Coapa, CDMX, Mexico.
Behavioural brain research
|December 31, 2023
概括
在老鼠中,母体多夫多妻性与雄性后代的同性伴侣偏好增加有关. 这表明在动物中存在潜在的兄弟出生顺序效应,影响性行为和伴侣选择.
科学领域:
- 神经科学是一个神经科学.
- 行为生物学 行为生物学
- 动物行为 动物行为
背景情况:
- 在包括动物在内的各种哺乳动物物种中观察到同性伴侣偏好.
- 兄弟出生顺序效应,年长的兄弟在男性中增加同性恋概率,在非人类哺乳动物中缺乏实验验证.
- 了解影响动物性偏好的因素,可以提供对保存的生物机制的见解.
研究的目的:
- 研究母亲生殖史对雄性大鼠同性伴侣偏好的潜在影响.
- 用实验来测试母体多夫妇或母体年龄是否会影响雄性大鼠的伴侣偏好和性行为.
- 为了探索在老鼠中兄弟出生顺序效应的可能性.
主要方法:
- 伴侣偏好被评估为年轻的雄性大鼠 (3个月大).
- 在一个圆柱形的舞台上评估性行为,观察与接受性女性和性活跃男性的相互作用.
- 对照组包括从初生 (第一次) 的年轻或老年母亲出生的男性.
主要成果:
- 与对照组 (4%) 相比,从多胎母出生的雄性大鼠的同性伴侣偏好发生率 (39%) 显著更高.
- 这种效应与母体多双性有关,而不是母体年龄,因为来自老年母体母体母体的男性与来自年轻母体母体母体母体的男性没有差异.
- 同性倾向的男性没有射精,并表现出类似女性的接收性和主性行为.
结论:
- 在老鼠中,母体多夫妻制与男性后代更有可能选择同性伴侣的可能性增加有关.
- 这些发现表明,类似于在人类中观察到的兄弟出生顺序效应可能在老鼠中起作用.
- 这项研究提供了实验证据,证明了同性伴侣偏好的生物学基础受到与母亲生殖史相关的产前或产周因素的影响.
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