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Iodine-Fluorine Relationships in Sheep Nutrition¹

Department of Agricultural Chemistry, Animal Husbandry and Veterinary Science, Purdue University Agricultural Experiment Station Lafayette, Indiana

Abstract

1. The growth of lambs was adversely affected by the fluorine from rock phosphate in the ration in amounts furnishing 6.0 milligrams of fluorine per kilogram of body weight and in lesser degree when smaller amounts were fed.

2. The addition of iodine to the ration did not counteract the deleterious influence of fluorine on the growth of lambs.

3. Lambs fed rations from this area of Indiana were deficient in iodine as evidenced by chemical and histological study of the thyroid glands.

4. Lambs fed rations supplemented with iodized salt had thyroid glands that were normal with respect to iodine content and microscopic structure of the thyroid gland.

5. The presence of fluorine in the ration increased the per cent of iodine in the thyroid glands of lambs both under conditions of adequate and inadequate iodine intake. However, the total iodine content of the gland increased with fluorine intake in some of the experiments and decreased in others.

¹ Journal paper No. 112, Purdue University Agricultural Experiment Station.

Supported in part by a grant from the Moorman Manufacturing Company, Quincy, Illinois.

Based in part on data presented by J. D. Hatfield to the Graduate School of Purdue University in partial fulfillment of the requirements for the degree of Doctor of Philosophy, December 1942.