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Pasture & Forage Minute: Winter Hay Worries About Magnesium Deficiency (Tetany) & Nitrate Poisoning

Pasture & Forage Minute: Winter Hay Worries About Magnesium Deficiency (Tetany) & Nitrate Poisoning


Grass tetany and nitrate poisoning are issues that we typically associate with animals grazing. However, both issues can be a problem in winter when animal diets are limited by what they are fed. Is your herd safe from possible hay worries?

Tetany occurs when an animal’s diet doesn’t have enough magnesium to meet nutritional needs. Complications with milk production and increased magnesium demand can make this imbalance even worse during lactation.

Grass, alfalfa, and cereal grains harvested for hay can all be low in magnesium. Getting a hay test with mineral analysis can easily show if this is an issue we need to worry about. If tests come back showing less than 0.15% magnesium, the hay is deficient. Other mineral interactions that can worsen tetany are low calcium (<0.40%) and high in potassium (>2.5%).

If your test comes back with issues, consider switching over to a high calcium and magnesium mineral. Most options use magnesium oxide, which is bitter tasting and can reduce animal consumption.

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