THYROIDAL I131UPTAKE IN FETAL SHEEP1

Abstract
The I131 concentration of the fetal thyroid gland in sheep was found to increase exponentially during the 2d to the 5th month of life. The total I131 in the fetal thyroid 1 month before parturition approximated the daily dose of radio-iodine administered to the dam. In the 5th month of gestation the I131 concentration in the thyroid gland of the fetus exceeded that of the dam''s thyroid.

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