THE OESTROGENS OF THE SOW IN EARLY PREGNANCY: ACCUMULATION OF OESTRONE IN THE ALLANTOIC FLUID

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Abstract
SUMMARY: The concentration of oestrogens was estimated by chemical methods in ovarian, placental and foetal tissues and in allantoic fluid obtained from sows at a stage of early pregnancy when increased amounts of oestrone are excreted in the urine (25–30 days after breeding). Relatively high levels of oestrone, as characterized by additional chemical procedures, were found in the allantoic fluid. Most of the oestrone in the allantoic fluid was present in an ether insoluble form. The levels of oestradiol-17β in the tissues examined seemed to be negligible. The origin of urinary oestrone excreted in the sow during early pregnancy is discussed.