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Iodine Concentration in Nonthyroid Tissues of Cows¹

University of Tennessee, Agricultural Research Laboratory², Oak Ridge 37830
and Department of Animal Science, Knoxville 37901

ABSTRACT

Radioiodine concentrations were determined in apparently normal and inflamed tissues of 12 cows after six to eight daily doses. Concentrations in diseased tissue as percentages of concentrations in corresponding normal tissue were: skin with hair, 124; macerated eyeball, 290; mammary gland, 214; and uterus, 318. Plasma thyroxine disappearance rates of four cows with injuries or infections including a bruised hock, an abscessed hock, a lacerated teat, and acute mastitis averaged 203% of normal. More rapid thyroxine disappearance rates in diseased cows could result from involvement of thyroxine in iodination reactions by phago-cytosing leucocytes. Inflamed tissues also concentrate inorganic iodide.

¹ This manuscript is published with the permission of the Dean of the University of Tennessee Agricultural Experiment Station, Knoxville.

² Operated by the Tennessee Agricultural Experiment Station for the U. S. Atomic Energy Commission under Contract No. AT-40-1-GEN-242.