Three parturient cows in lateral recumbency which were moaning and had tachycardia, arrhythmia and dyspnoea were thoroughly examined. They were hypocalcaemic (0.70-1.27 mmol/litre) and were euthanased within four days, because they failed to respond to calcium treatment. By light microscopy the most characteristic pathological changes in the heart were necrotic changes scattered throughout the myocardium. Electron microscopy revealed abnormalities in the myocytes which were characterised by focal myofibrillar lysis, irregular splitting, streaming and spreading of the Z band and myofibrillar disarray.
- British Veterinary Association. All rights reserved.
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