Multiparity favors same-sex partner preference in male rats

被引:2
作者
Hernandez, Alejandra [1 ]
Hoffman, Kurt [2 ]
Reyes, Rebeca [1 ]
Fernandez-Guasti, Alonso [1 ,3 ]
机构
[1] Ctr Invest & Estudios Avanzados IPN, Dept Farmacobiol, Unidad Coapa, Mexico City, Mexico
[2] Ctr Invest Reprod Anim, Cinvestav UAT, Tlaxcala, Mexico
[3] Dept Farmacobiol, Cinvestav, Calzada Tenorios 235,Sede Sur, Mexico City 14330, Mexico
关键词
Sex preference; Multiparity; Rat male and female sexual behavior; Fraternal birth order effect; MEDIAL PREOPTIC AREA; PRENATAL STRESS; SDN-POA; BEHAVIOR; DIFFERENTIATION; BRAIN; MASCULINIZATION; HOMOSEXUALITY; INDUCTION; LORDOSIS;
D O I
10.1016/j.bbr.2023.114842
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Same -sex partner preference is present in many mammals, including rodents. Several possible causal factors have been proposed for the establishment of this preference. The Fraternal Birth Order effect refers to the observation that older brothers increase the probability of homosexuality in men, but no experiment has analyzed this possibility. In this study, partner preference (tested in a three compartments box) and female and male sexual behavior (studied in a cylindrical arena) were evaluated in young male rats (3 months) born to multiparous mothers that had 4-6 previous gestations and around 12 months of age. Control groups were young male rats born to primiparous young (4 months) or aged (12 months) mothers. In the partner preference test, the males born to multiparous dams spent less time interacting with the receptive female and more time interacting with the sexually active male, and a 39% exhibited same -sex partner preference. This high percentage seems related to multiparity of their mothers and not to maternal age, because the males born to primiparous aged females (12 months) showed a similar low proportion of same -sex partner preference than the males born to young (4 months) primiparous females (4%). In the sexual behavior tests, no male born of a multiparous dam and with same -sex preference ejaculated and 54% displayed proceptivity and lordosis. Present results suggest that the fraternal birth order effect may occur also in rats.
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页数:6
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