Effects of Estrone and Progesterone on Male Rabbit Mammary Glands. II. Varying Doses of Estrone.

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Abstract
Six groups of immature male rabbits were injected 5 days weekly for 5 weeks with 30, 60, 120, 240, 480, and 960 LU. of estrone respectively. The best mammary duct growth occurred in the animals receiving 120 LU. The 30 and 60 LU. animals showed slightly less extensive duct systems, and the higher levels caused cystic changes in the main ducts.