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Journal of Dairy Science Vol. 48 No. 8 1118-1121
© 1965 by American Dairy Science Association ®
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Effect of Feeding Thiocyanate to Dairy Cows on Absorption and Clearance of Intramammary Iodine1

J. K. Miller, E. W. Swanson and R. G. Cragle

Agricultural Research Laboratory of the University of Tennessee, Oak Ridge2

ABSTRACT

One of the most widely studied of goitrogenic anions has been thiocyanate (4). The effect of this compound in reducing accumulation of iodine from the blood also extends to extrathyroidal iodine—concentrating mechanisms (1). Movement of iodine from blood plasma to milk is reduced when thiocyanate is fed to cows (3, 11). In the present report, the effects of thiocyanate on passage of iodine from the udder to blood plasma of dairy cows were investigated.

EXPERIMENTAL PROCEDURE

Three cows were used to compare the metabolism of oral and intramammary radioiodine. Each cow received 4 me I131 through the streak canals into the gland cisterns of two quarters and 1 mc I125 orally via gelatin capsule after the evening milking. Dosed and nondosed udder halves were milked and sampled separately for five days. Three additional cows were each dosed with I131 by intramammary infusion of 1.2 mc per quarter after the evening milking. After the morning milking 64 hr later, each cow was given 10 g sodium thiocyanate orally.

FOOTNOTES

1 This manuscript is published with the permission of the Director 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.






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Copyright © 1965 by the American Dairy Science Association ®.