Major metabolic disorders of sheep: what is new and what can we do?

Several metabolic disorders affect sheep in the UK. The main disorders of the periparturient period are ovine pregnancy toxaemia (‘twin-lamb’ disease), hypocalcaemia and hypomagnesaemia. None of these disorders are new, however, further research and evidence continues to come to light which should impact the actions of, and advice given by, farm animal practitioners. To combat metabolic disorders effectively a flock-wide approach must be taken, starting in advance of the lambing season. The challenge for veterinary surgeons is engaging their sheep clients early enough to prevent these disorders occurring in the first place, rather than focusing on treatment of individual clinical cases. This can be best achieved by having a clear understanding of the aetiology, diagnosis and treatment of the metabolic disorders of the periparturient ewe.