Iodine functions as an essential component of the hormone, thyroxine, which regulates metabolic rate. Thyroxine has an important influence on the growth rate and production of livestock. First indication of iodine deficiency is enlargement of the thyroid (goiter) of newborn calves. Calves also may be born hairless, weak, or dead.

In adult cattle, iodine deficiency can cause enlarged thyroid glands, reduced fertility (males and females), and increased morbidity. Lactating cows suffering from mild iodine deficiency will produce less milk, have a poor hair coat and have increased incidence of mastitis. Furthermore, animals that have a subclinical iodine deficiency will have increased incidence of foot rot and respiratory disease due to suppressed immune responses.

We have now brought out a new bolus with iodine added to help prevent iodine deficiency.

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All Telsol's glass boluses contain cobalt, copper and selenium with either iodine or zinc.
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