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Journal of Dairy Science Vol. 53 No. 6 772-775
© 1970 by American Dairy Science Association ®
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Metabolism of Sodium Iodide, Calcium Iodate, and Pentacalcium Orthoperiodate Initially Placed in the Bovine Rumen or Abomasum1

B. R. Moss2 and J. K. Miller

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

ABSTRACT

Effects of placement in either the rumen or abomasum on metabolism of radio-iodine from single doses of 125I-labeled pentacalcium orthoperiodate (PCOP) or calcium iodate in comparison with that from Na131I were investigated with four calves in two trials. Ratios of plasma 125I to 131I after abomasal and rumen dosing, respectively, averaged 0.70 and 0.09 for PCOP and 0.77 and 0.52 for calcium iodate at 1 hour, and 0.64 and 0.03 for PCOP and 0.59 and 0.53 for calcium iodate at 3 hours. Between 6 and 24 hours after dosing, the ratios approached unity. Solubility and paper chromatographic studies indicated the delayed uptake of 125I from PCOP or calcium iodate placed in the rumen resulted from a slower reduction to iodide than when the compounds were placed in the abomasum. The initial difference in the metabolism of the iodine compounds disappeared within 24 hours and would not affect the nutritional availability of iodine from either compound to cattle receiving a daily supplement.

FOOTNOTES

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 Animal and Range Sciences, Montana State University, Bozeman 59715.

3 Operated by the Tennessee Agricultural Experiment Station for the U.S. Atomic Energy-Commission under Contract no. AT-40-1-6EN-242.






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Copyright © 1970 by the American Dairy Science Association ®.