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131I concentrations in blood, milk, urine and faeces of dairy cows following a single dose of radio-iodine

Published online by Cambridge University Press:  27 March 2009

F. W. Lengemann
F. W. Lengemann
Affiliation:
Department of Physical Biology, New York State Veterinary College, Cornell University, Ithaca, New York, U.S.A.
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Extract

1. The concentrations of 131I in milk, urine, and faeces were compared to the total and non-proteinbound radio-iodine of blood after a single dose of radio-iodine to cows that were being maintained on diets providing about 3·5 or 12-16 mg. of stable iodine per day.

2. In general, the 131I concentrations in milk and urine tended to parallel the non-protein-bound 131I of blood. Faecal 131I levels of the low-iodine cows tended to parallel that of the whole blood, whereas it followed the non-bound radio-iodine of blood for cows on the higher stable iodine diet.

3. Compartmental analysis of the concentration curves showed a component with a T½ of from 10 to 22 hr. being common to both groups of cows. The second component of the curves constructed for the cows on the higher iodine intake had a T½ of from 41 to 58 hr. The second component for the low-iodine cows had a T½ that ranged from 83 to 169 hr. for the urine, faeces and non-bound radio-iodine of blood and 1200 and 1580 hr., respectively, for the faecal and whole-blood curves.

4. A greater proportion of bound radio-iodine was observed in the milk and blood of cows on the low-iodine diet than for the cows on the higher iodine intake. The proportion of bound 131I in blood increased with time, but the bound 131I of milk was relatively constant.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 61 , Issue 3 , November 1963 , pp. 375 - 379
Copyright
Copyright © Cambridge University Press 1963

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References

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