Abstract
Litter sex ratio at birth was studied in two laboratory colonies of root voles Microtus oeconomus originating from northern and southern Norway, respectively Sex ratio was female biased in the northern (57% females), but not in the southern colony Sex seemed to be binomially distributed within litters of both colonies, and did not show consistent relationships with mother weight, litter size, parity or number of generations bred in the laboratory Both colonies originated from populations exhibiting cyclic population dynamics in the wild Thus different demography as such is unable to explain the difference in sex ratio between the two laboratory colonies Social organization has been shown to differ between the two strains of root voles both in the field and in the laboratory, but it is yet unclear whether this factor is related to the sex ratio difference documented in this laboratory study
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