Abstract
Revolving drums were used to measure the activity of 8 [male] and 7 [female] rats gonadectomized 1-10 days after birth. Both [male][male] and [female][female] reached a plateau at 50 days (average) near 2,000 revolutions. Normal [female][female] reached a plateau at 120 days near 10,500 revolutions, and [male][male] near 10,000.