Coprac is a ruminal bolus for cattle providing slow release supplementation of copper, where dietary intake of copper is low, and 25mg of cobalt. A proportion of the copper oxide needles lodges in the folds of the animal? stomach lining. This provides a sustained-release source of copper. This steady supplementation ensures adequate copper status but avoids the sharp rises in copper levels which can be associated with copper toxicity. Use with cattle weighing over 200kg when trace element supplementation. is indicated and copper is required. Copper is released for approximately 6 months. Extra applications are safe for larger animals.