Clark M M, Galef B G, vom Saal F S
Department of Psychology, McMaster University, Hamilton, Ontario, Canada.
Dev Psychobiol. 1991 Mar;24(2):81-90. doi: 10.1002/dev.420240202.
Examining data describing the sex composition of 1074 Caesarean-delivered litters of house mice, 253 Caesarean-delivered and 265 vaginally delivered litters of Mongolian gerbils, and 854 vaginally delivered litters of golden hamsters, we determined whether segregation of sexes between uterine horns and correlations between litter size and litter sex ratio were present in each of the three rodent species studied. Although significant deviations from expected distributions of male and female fetuses were found, these deviations from chance were not the same in any two of the three species examined. Analyses also indicated that the correlation between litter size and litter sex ratio that Huck, Seger, and Lisk (1990) found in vaginally delivered infant hamsters is present in vaginally delivered infant Mongolian gerbils, but not in their Caesarean-delivered colony mates. In gerbils, and perhaps hamsters as well, the correlation between litter size and litter sex ratio appears to be a result of sex-biased perinatal mortality correlated with litter size rather than of sex-biased conception correlated with litter size.
通过研究描述1074窝剖腹产家鼠、253窝剖腹产及265窝阴道分娩长爪沙鼠、854窝阴道分娩金黄地鼠的性别构成的数据，我们确定了在所研究的三种啮齿动物中，子宫角之间的性别分离以及窝仔数与窝仔性别比之间的相关性是否存在。尽管发现雄性和雌性胎儿的预期分布存在显著偏差，但在所检查的三个物种中的任意两个物种中，这些与随机情况的偏差并不相同。分析还表明，哈克、西格和利斯科（1990年）在阴道分娩的幼龄地鼠中发现的窝仔数与窝仔性别比之间的相关性，在阴道分娩的幼龄长爪沙鼠中存在，但在剖腹产的同种群中不存在。在长爪沙鼠中，或许在金黄地鼠中也是如此，窝仔数与窝仔性别比之间的相关性似乎是与窝仔数相关的性别偏向性围产期死亡率的结果，而非与窝仔数相关的性别偏向性受孕的结果。
