what is magnesium bolus

Magnesium bolus is a dietary mineral supplement designed primarily for cattle to reduce the risk of magnesium deficiency, which can lead to conditions like tetany or "head disease" (hypomagnesemia). It typically comes in the form of a bolus (a large pill) that is administered orally using a bolus applicator. The bolus provides a controlled and sustained release of magnesium over a period, often around one month or 21 days, to meet the animal's daily magnesium needs. This supplement is particularly useful during periods when cattle are at risk of magnesium deficiency, such as when they graze on young grass in the spring, which may contain insufficient magnesium. The bolus contains magnesium in various forms such as magnesium oxide, and may also include other minerals to support health. The common administration practice involves giving 1 or 2 boluses at once, with a possible repeat after a month if needed. It is generally intended for cattle above a certain weight (e.g., 250 kg or 300 kg) and should be given with veterinary or nutritional expert advice for proper balance in their diet. In summary, a magnesium bolus helps prevent magnesium deficiency in cattle by providing long-term magnesium supplementation through oral administration.