Abstract
The concentrations of follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin, progesterone, androstenedione and oestradiol were determined in the antral fluid of ovarian follicles > 1 mm in diameter as well as in ovarian venous or peripheral venous plasma, or both, from at least four different animals on each day throughout the oestrous cycle of the sheep. The individual steroid hormones in antral fluid were examined in relation to the steroid-secretion rates in ovarian venous plasma, follicle size and the hormone levels in jugular venous plasma.
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