Abstract
Summary
Thyroid activity in 18-day embryos from hens fed 3 levels of dietary iodine was studied with the use of I131. The thyroid glands of embryos from hens on the lowest level of iodine synthesized and released thyroxine at a much faster rate than embryos from hens on higher levels of iodine. This rapid synthesis and release of thyroxine in more active thyroid glands can confound measusements of thyroid activity by I131 “uptake” procedures if care is not taken in selecting proper time intervals between injection and autopsy.
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