Abstract
Arterial and uterine venous concentrations of alpha amino nitrogen and uterine blood flow were repeatedly measured in twelve non‐pregnant and ten pregnant Dorset ewes.The arterial levels and uterine arteriovenous differences of alpha amino nitrogen were low early in gestation and gradually increased to approach non‐pregnant values towards the end of gestation. The uterine uptake of alpha amino nitrogen per kilogramme of uterine tissue behaved in a similar way but remained lower than the uptake per kilogramme of tissue by the non‐pregnant uterus.The data suggest that the removal of amino acids by the uterus is independent of the levels in the blood reaching the organ.
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