Extra Magnesium

MegaMin Extra Magnesium

High Magnesium, Macro Mineral and Trace Mineral Supplement to Assist in the Prevention of Grass Tetany


MegaMin Extra Magnesium supplement is formulated to provide extra magnesium for stock grazing lush green pastures and winter cereals. The combination of extra magnesium in addition to broad spectrum macro and trace minerals provides essential nutrients that can often be lacking in lush green pastures and forages.


Magnesium, macro and trace minerals are essential for sheep and cattle grazing lush green pastures, winter cereals and on soils low in magnesium.


Magnesium deficiency can suppress appetite and reduce feed intake.  In severe cases, grass tetany can cause death of sheep and cattle grazing lush green, low fibre forages.


Magnesium supplements can be quite bitter and for that reason we have a highly palatable Extra Magnesium Sweet blend available for those situations where intake is challenging.

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  • 20kg Bag
  • 1t Bulk Bag

Feeding Guide

Feeding rate – 20-40kg per 100kg body weight.









Consumption rates may vary depending on weather, pasture and livestock conditions. During peak demand use the higher level of the feeding guide. It is preferable to keep this product dry when feeding to maintain palatability. Withholding period: NIL

Why broad spectrum Minerals are essential

Minerals and trace minerals are needed year round by livestock for optimum production, health and fertility. Read more >


Why Magnesium is important?

  • Magnesium is absorbed in the rumen and is the second most limiting mineral for stock grazing lush green pastures and winter forage. Lush green fodder passes too quickly through the rumen to allow adequate absorption of Magnesium, which can lead to ‘Grass Tetany’.
  • Plant uptake of Magnesium may also be reduced in the cooler months, increasing the need for supplementation.
  • Magnesium stored in the body is not rapidly available so animals are reliant on daily intake, particularly during ‘high risk’ periods.
  • Magnesium may aid in reducing stress, during weaning, sales, shows and transport and assist with meat quality.
  • Lack of Magnesium can significantly reduce milk production.
  • Because mature fodder has a higher Magnesium level in the stem, it is recommended to give animals access to roughage and legume hay during high risk periods for grass tetany.
  • Assists with calving and lambing

Grass Tetany

Caused by low blood Magnesium levels, Grass Tetany (hypomagnesaemia) may occur throughout the year on both tropical and temperate pastures. Symptoms include restlessness, staggers, over-alertness or even aggressiveness. In severe cases, livestock can die suddenly, so prevention is important. Read more >