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Definition and Etiology Hypomagnesemic tetany in cow (lactation tetany/ grass tetany/grass staggers) is a complex metabolic disorder characterized by hypomagnesemia (<1.5 mg/dl in serum), hyperexcitability, muscular spasm, seizures, respiratory distress, collapse, and death. It occurs in calves aged between 2 and 4 months which are fed exclusively on milk because of the fall in the […]