Abstract
The sex ratio of the fetuses from mice treated with pregnant mare's serum (PMS)/human chorionic gonadotropin (HCG) to induce ovulation did not differ appreciably from that of spontaneously ovulated controls. Rather, an intriguing observation was that the sex ratio in the right uterine horns tended to be lower than that in the left horns in both spontaneously ovulated controls and PMS/HCG-treated groups. We speculate on its possible relation to the observed right-left asymmetry of horn sizes (number of fetuses in the horn).
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