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The seeding year’s growth of alfalfa, ladino clover and birdsfoot trefoil has been shown to be essentially free of estrogenic activity. Uninterrupted second-year growth of alfalfa and ladino clover displays relatively high activity in the spring, little or none in mid-summer, and an intermediate level of activity in the autumn. Sequential cutting leads to a modification of this pattern. The presence of slight activity in birdsfoot trefoil and the absence of activity in orchard grass has been demonstrated.

canadian journal of animal science

THE ESTROGEN-LIKE SUBSTANCES IN CERTAIN LEGUMES AND GRASSES: II. THE EFFECT OF STAGE OF MATURITY AND FREQUENCY OF CUTTING ON THE ESTROGENIC ACTIVITY OF SOME FORAGES