Clark M M, Vonk J M, Galef B G
Department of Psychology, McMaster University, Hamilton, Ontario, Canada.
Physiol Behav. 1997 Jan;61(1):77-81. doi: 10.1016/s0031-9384(96)00313-7.
We compared reproductive profiles of Mongolian gerbils gestated alone in a uterine horn (Isolate males and Isolate females) with those of gerbils gestated in intrauterine positions between two male fetuses (2M males and 2M females) and two female fetuses (2F males and 2F females). We found that, when adult, the reproductive profiles of gerbils that had been gestated as isolates resembled that of gerbils that had been gestated as 2F fetuses: 1. Isolate females gestated litters containing both the same proportion of males as the litters of 2F females and a significantly smaller proportion of males than litters of 2M females. 2. Isolate males, like 2F males, were less likely to impregnate females than were 2M males, and 3. both 2F males and isolate males exhibited disturbed patterns of copulation and reduced levels of scent-marking relative to 2M males. Our results were entirely consistent with the view that intrauterine exposure to males, but not to females, was responsible for previously described differences in the reproductive profiles of 2M and 2F Mongolian gerbils.
我们比较了在子宫角单独妊娠的蒙古沙鼠（隔离雄性和隔离雌性）与在两个雄性胎儿（2M雄性和2M雌性）和两个雌性胎儿（2F雄性和2F雌性）之间的子宫内位置妊娠的沙鼠的生殖特征。我们发现，成年后，作为隔离个体妊娠的沙鼠的生殖特征与作为2F胎儿妊娠的沙鼠相似：1. 隔离雌性所产窝仔中雄性比例与2F雌性所产窝仔相同，但显著低于2M雌性所产窝仔。2. 隔离雄性与2F雄性一样，使雌性受孕的可能性低于2M雄性，并且3. 相对于2M雄性，2F雄性和隔离雄性均表现出交配模式紊乱和气味标记水平降低。我们的结果完全符合以下观点，即子宫内接触雄性而非雌性是导致先前描述的2M和2F蒙古沙鼠生殖特征差异的原因。
