Degenerative myopathy in housed yearling bulls

In an outbreak of a degenerative myopathy six animals from a group of 20 intensively reared yearling bulls were affected. With one exception there was no history of stress or unaccustomed exercise. The diet was found to be deficient in vitamin E and selenium and it is thought that the rapid growth rate of the bulls concurrent with a continuing myodegeneration was sufficient to precipitate clinical disease.