STUDIES ON THE SUBACUTE AND CHRONIC ADMINISTRATION OF STILBESTROL IN THE MALE RAT

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Abstract
The temporary effects of the administration of stilbestrol upon body weight, weight of the accessory sex organs, and the reproductive capacity of the male white rat have been studied. A linear relationship was obtained when the logarithm of the dose of stilbestrol administered (0.0125 to 5.0 mgm.) was plotted against the percentage decrease in testes weight. This same relationship was also found when the log of the dose was plotted against the percentage decrease in body weight although this line had a much more gradual slope.When the administration of stilbestrol was discontinued, the seminal vesicles coagulating glands, and ventral prostrates regained their weight by the third to fourth week but the weights of the testes remained below the control values until the sixth to ninth week. In a breeding experiment it was shown that a daily dose of 7.5 μgm. of stilbestrol causes sterility in the male. This does also slightly affected the weight of the accessory sex organs and their cellular structure.

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