Abstract
Summary The plasma protein-bound iodine concentration of young calves has been found to be much higher during the first 48 hours postpartum than at any later time. This high level appears to be due to the ingestion of colostrum, which was found to contain relatively large amounts of protein-bound iodine during the first 12 hours after calving. Histological evidence is presented showing that large amounts of colloid are stored in the thyroid follicles as the plasma PBI level falls. It was found also that the plasma PBI concentration of the dam is depressed on the day of calving. The possible significance of this is discussed.
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