Hypomagnesaemia

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  • Magnesium is important for muscular and nervous conduction.
  • Low Mg ++ diets may induce acute hypo-magnesaemia in lactating cows.
    • Seen as tremors and convulsions (tetany).
    • For example, poor quality silage.
  • High K+ diets induce a relative Mg++ imbalance.
    • For example, lush pasture.
    • Known as "grass staggers".
    • Produces tetany and ataxia, and sometimes cardiac arrest.
    • Only shock haemorrhages can be seen at autopsy; i.e. non-specific findings.