Gandelman R
Horm Behav. 1986 Sep;20(3):287-93. doi: 10.1016/0018-506x(86)90038-3.
Fetal female guinea pigs were delivered surgically and their position within a uterine horn relative to male fetuses was noted. When adult they were ovariectomized, injected daily with testosterone propionate, and examined for male copulatory behaviors in response to the presence of a receptive female. Females that developed contiguous to a caudal male were functionally similar to those that had been situated between two males; both exhibited enhanced levels of mounting relative to females that were located contiguous to no males (with and without the presence of a caudal male) and to females contiguous to a cephalic male. Therefore, both contiguity and positioning of the male fetus are necessary conditions for prenatal masculinization of the female guinea pig. Lastly, four animals that had resided singly in the uterus displayed the lowest levels of copulatory behaviors.
通过手术取出雌性豚鼠胎儿，并记录其在子宫角内相对于雄性胎儿的位置。成年后，对它们进行卵巢切除，每天注射丙酸睾酮，并观察它们在有发情期雌鼠时的雄性交配行为。与尾侧雄性相邻发育的雌性在功能上与位于两个雄性之间的雌性相似；相对于没有与任何雄性相邻（无论有无尾侧雄性）以及与头侧雄性相邻的雌性，这两种情况下的雌性都表现出更高水平的骑跨行为。因此，雄性胎儿的相邻和位置对于雌性豚鼠的产前雄性化都是必要条件。最后，单独在子宫内的四只动物表现出最低水平的交配行为。
