Abstract
Injections of oestrogen and progesterone into pregnant rats in doses near the physiological level decreased the secondary sex ratio of the young to 80.4 males per 100 females in females ovariectomized on the 8th day of pregnancy, and increased it to 122.2 in intact females. These differences are significantly different (P<0.05) from the control sex ratio of 101.2 and highly significantly different (P<0.005) from each other.

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