Equine goiter associated with excess dietary iodine

Abstract

Natura I occurring goiter cases are described in 2 newborn Arabian foals whose mares were supplemented with excess iodine during the final 24 w of the pregnancy. Six nursing foals and 2 mares were a I so affected clinical with thyroid hypertrophy. At I east 12 times the maximum tolerable level of iodine supplementation was given, as the dais iodine intake for each mare was 299 mg. The prevalence of goiter cases was 2 and 9% in the mares and foals, respective.