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Oestrogens and progestagens in rat ovarian follicles during the oestrous cycle

Maria Szotys

Summary. The amounts of follicular oestrogens increased simultaneously with the growth of follicles to reach a maximum on the day of pro-oestrus at 18:00 h, then decreased rapidly. Progestagens were detectable only in large follicles excised at pro-oestrus. Small follicles at pro-oestrus contained small amounts of oestrogens.