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Trace Elements in Abiotic and Biotic Environments
21.7 ANIMALS
In animals, I intoxication may occur when toxic doses of I are very high. Severe or
fatal intoxication in calves occurs after the prolonged administration of I, at a dose
of 10 mg/kg/day. Iodism in cattle is manifested by a persistent cough, hyperthermia,
naso-ocular discharge, in-appetency, depression, dermatitis, and alopecia. In sheep,
depression, anorexia, hyperthermia, cough, changes in the respiratory system, and
sometimes death were reported. No specific antidotes against iodism are available.
Remission of the problem requires the elimination of I sources (Paulíková et  al.
2002). I requirements of food-producing animals vary between 0.15 and 0.6 mg/kg
of feed, according to various scientific committees (Flachowsky 2007).