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Radioiodine Absorption and Secretion by the Calf Abomasum¹

Agricultural Research Laboratory of the University of Tennessee³, Oak Ridge 37830

ABSTRACT

The bidirectional passage of radioiodine between the blood and abomasum was investigated in 12 anesthetized calves. Ratios of abomasal venous to arterial ¹³¹I concentrations averaged 0.84 ± 0.13 (sd) during 24 minutes and 0.72 ± 0.13 at 24 hours after intravenous administration indicating 16 to 28% removal of circulating iodine by the abomasum. Recovery of ¹²⁵I in abomasal contents 25 minutes after injection into the abomasum averaged 72 ± 23%. Movement of iodine from the abomasal lumen to the blood was further indicated by rapid appearance of ¹²⁵I in abomasal venous blood which plateaued between 2 and 3% of the ¹²⁵I dose per liter within seven minutes. A negative relationship (r = 0.96, P < .01) was found between ¹³¹I uptakes by the thyroid and abomasum 24 hours after dosing.

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

² Present address: Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg 24061.

³ Operated by the Tennessee Agricultural Experiment Station for the U.S. Atomic Energy Commission under Contract AT-40-1-GEN 242.