Seasonal variation in oestrogenic activity, coumestrol and formononetin content of white clover

Abstract
Summary: The oestrogenic activity, coumestrol and formononetin content of white clover collected during the months May to December 1970 and 1971 was assayed in mice. The results showed considerable variations in oestrogenic activity which did not seem to be associated with a specific time of year or quantitatively related to the coumestrol content of the pasture.