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Protein-Bound Iodine Levels in Dairy Cattle Plasma^{1, 2,}

Dairy Department, Michigan State College, East Lansing

ABSTRACT

Today's economic situation demands that we obtain the greatest possible efficiency in the production of milk, butterfat and meat from our dairy animals. This cannot be done unless we thoroughly understand the physiological functioning of cattle and so select and manage them as to utilize fully their productive potentials.

A long step forward would be taken if some means could be developed whereby the future worth of an animal could be estimated while it was' still a calf. An endocrine analysis may offer some possibilities in this direction. Unfortunately no suitable assay method exists for some of the hormones, but the rate of secretion of the thyroid hormone, which has been shown to be related to dairy cattle performance, is closely related to the plasma level of proteinbound iodine in many species. It has been a useful tool in estimating thyroid function in human medicine and is closely related to thyroid activity in rats, mice, dogs, rabbits and other laboratory animals.

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.

² Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1389.