Equine grass sickness may be caused by a neurotoxic enzyme with similarities to toxins in snake venoms, according to research involving the Royal (Dick) School of Veterinary Studies' Equine Hospital. The finding offers promise of new treatments for the deadly disease in grazing horses, which causes intestinal paralysis, colic, inability to swallow and muscle tremors. It currently has no cure and leads to death in 1 per cent of horses grazing in high-risk premises. Professor Bruce McGorum from the Royal (Dick) School of Veterinary Studies' Equine Hospital said, "Identifying a...