GROWTH OF THE MALE GUINEA PIG MAMMARY GLAND WITH DIETHYLSTILBESTROL1,2

Abstract
Groups of 3 to 5 [male] guinea pigs were given subcut. injs. of diethylstilbestrol at dosages from 0.01 to 50.0 [mu]g. per day. Although no obvious signs of main duct growth were apparent some extension of the mammary glands appeared to have occurred at 0.1 [mu]g. per day and above. Lobule development occurred in all groups showing duct extension. Early lobules contained no alveoli but when developed further alveoli were numerous. Development of [male] mammary glands did not compare favorably with that secured in a single [female] treated. No secretion was observed in the [male] glands. The teats of [male] guinea pigs in all groups were larger than controls. Higher dosages caused no greater development than did 0.1 [mu]g. per day.