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Grass Tetany (Hypomagnesaemia)
Endocrine and MetabolicBovineOvineNew
Key Points
  • Hypomagnesaemia is a potentially fatal metabolic disorder of grazing ruminants
  • Common in lactating cattle on lush pasture, especially after cold, wet weather
    • Often occurs alongside hypocalcaemia
  • Caused by reduced magnesium intake or absorption rather than a lack of body stores
  • Classic signs include hyperaesthesia, tremors, stiffness and seizures
  • IV magnesium (+ calcium) therapy is life-saving
  • Prevention relies on dietary magnesium supplementation
  • Sudden death may be the first sign, especially in cattle
Differential Diagnoses
  1. Milk fever (hypocalcaemia)
  2. Polioencephalomalacia
  3. Listeriosis
  4. Lead poisoning
Overview
Aetiology
Clinical Signs
Diagnosis
Treatment
Prevention
Resources
Overview

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Aetiology

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Clinical Signs

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Diagnosis

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Treatment

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Prevention

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Resources

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Educational content only. This factsheet is for general veterinary education and is not a substitute for professional veterinary advice, diagnosis, or treatment. Not for use in an emergency — contact a veterinarian or emergency service. Full disclaimer →