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Changes in the Plasma Level of Protein-bound Iodine in the Young Calf¹

Dairy Department, Michigan State College, East Lansing

ABSTRACT

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.

¹ Data contained in this publication are from a thesis submitted by the senior author to the Graduate School of Michigan State College in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1420.