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  • Cal Mag & Grass Tetany

    Cal Mag

    Grass Tetany is an easily prevented but fatal disease of dairy cows.  This is a big financial loss and can be avoided, and is most likely to occur in the springtime.

    The cow needs to be supplied 2.5oz of Calcined Magnesite daily to prevent Grass Tetany, as cows cannot store Magnesium.

    Grass Tetany (Grass Staggers) causes lack of co-ordination and nervousness.  Second rotation is the most susceptible time especially if the weather is cold and wet.

    The most common way practiced to prevent Grass Tetany is to have the Dairy Feed formulated so the cow is provided with 2.5oz (65gm)/day of Calcined Magnesite (Cal Mag).

    Attention must be taken with the inclusion rate and the feeding rate of the Dairy feed to ensure they are fed the appropriate amount to supply the 2.5oz/day.   The feed label clearly states the feeding rate to supply the 2.5oz/day, and this must be followed accordingly to provide protection.

    Establishing the feeding rate with the farmer when he orders feed is most important.  There is much variation in feeding rates in springtime, due to farming systems, grass supply, and milk yield expectations.  Some could be feeding in excess of 6kg/day while others maybe 3kg/day.

    Call Shane on 086 8663638 or John on 086 0427072 in Wallace’s Agri today!

  • Products and Present Cal Mag Rates / per day

    SuperGraze                          4kg

    Breeders Supreme             4kg

    GrassMate                            3kg

    Pasture Graze                     2.5kg

    Maxegal                                5kg

    Lacto                                      5kg

    Super Red                             6kg

    Milkosol                                6kg

  • Key Points for Grass Tetany

    • Is there a history of Grass Tetany on the farm?
    • High Potash (K) soils most prone
    • High risk after spring application of cattle slurry
    • Cold wet weather
    • 2nd Rotation high risk
    • Cows in heat, not eating their full feed in the parlour
    • Coarse feed segregation


    Other Options to Reduce Risk

    • Soluble Magnesium
      Salts in the water
    • Pasture Dusting
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