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Nutrient Interactions and Toxicity
Research Communication

Oral Iodine Toxicity in Chicks Can Be Reversed by Supplemental Bromine

Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, IL 61801

¹To whom correspondence should be addressed. E-mail: dhbaker{at}uiuc.edu.

Four chick bioassays were conducted to quantify iodine (I) toxicity and its amelioration in young chicks. A supplemental I level from KI of 600 mg/kg depressed growth in chicks fed methionine-deficient diets but not in those fed methionine-adequate diets. An I dose level ≥ 900 mg/kg was required to cause growth depression in chicks fed a methionine-adequate corn-soybean meal diet. Iodine intoxicated chicks also displayed neurological symptoms and extreme malaise, but dose levels up to 1200 mg I/kg had no effect on blood hemoglobin or hematocrit. Supplemental I levels of 1000–1500 mg/kg caused severe growth depressions that could be totally reversed by dietary addition of 50 or 100 mg/kg bromine provided as NaBr. Nuclear accidents or terrorist actions that result in I toxicity and thyroid cancer or goiter may benefit from use of NaBr as a therapeutic agent.

KEY WORDS: • iodine • toxicity • bromine • chicks

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