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Scientific Articles

Serum free thyroxine levels in cats maintained on diets relatively high or low in iodine

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Pages 101-103 | Accepted 03 Sep 1993, Published online: 22 Feb 2011
 

Abstract

Excessive or deficient intake of iodine may play a role in the development of goitre and hyper-thyroidism in cats. Previous investigations have shown that the serum free thyroxine level of cats is affected by brief administration of food high or low in iodine content. We have now measured serum free thyroxine levels in groups of cats fed relatively high or low iodine diets for much longer periods (5 months). In contrast to our earlier findings, the chronic ingestion of relatively high or low iodine diets did not lead to statistically significant differences in serum free thyroxine levels. The results of the present investigations show that the cat is able to maintain normal levels of thyroid hormone despite prolonged high or low iodine diets. It may be that the adaptive mechanisms that are called into play during chronic high or low iodine intake lead to thyroid disease, particularly in certain predisposed individuals.

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