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.
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