[Congenital white muscle disease in a Belgian blue calf].
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In this case report about white muscle disease (WMD) in a Belgian Blue herd, the disease is described both as an individual and as a herd problem. Aetiology, diagnosis, and therapy of WMD are discussed. WMD is a disease of animals with muscle damage due to the presence of free radicals. Unsaturated fatty acids in the cell membrane are transformed into a radical form in a chain reaction: a fatty acid next to the fatty acid radical can be transformed into another free radical. In healthy animal the chain reaction is stopped by anti-oxidants such as vitamin E and glutathione peroxidase. WMD can occur when more free radicals are produced than the available anti-oxidants can deal with. The disease occurs in calves, lambs, and foals.