Antifertility action of a sterol sulphate in the rabbit

Abstract
Introduction of 0.5 mg .beta.-sitosteryl sulfate, a potent acrosin inhibitor, in K-Y jelly into the vagina of rabbits before coitus lowered the pregnancy rate [by preventing sperm penetration of the zona pellucida]. Cholesteryl sulfate had no effect. A 1.5 .times. 10 mm silicone rod containing 10% (wt/wt) .beta.-sitosteryl sulfate released 1-2 .mu.g of compound per day over a 16-day period in vitro. When such implants were placed in rabbit uteri, there was a significant reduction in the number of embryos in those horns.

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