This usually involves an intravenous injection of a magnesium and calcium solution. It is advisable for a veterinarian to administer the drug while simultaneously monitoring the heart's reactions. If too much is given too quickly, the animal will not survive. Grass tetany is usually preventable by providing the animal access to mineral blocks containing ample amounts of magnesium. In extremely critical cases, the producer may also wish to add supplemental magnesium in the form of magnesium oxide to the feed.
Many farmers sprinkle the magnesium oxide on the hay.
Two ounces per head, per day is considered sufficient. Forage makes rapid growth in the absence of many important elements. Grass tetany becomes a year-round threat. But, when not followed quick action is necessary to save the animal. All forms of stressful action must be avoided.