A magnesium bolus is a controlled-release supplement given orally to cattle, mainly to prevent and reduce the risk of hypomagnesemic tetany (commonly called grass tetany or head disease), which is a condition caused by magnesium deficiency. The bolus provides a long-term supply of magnesium, typically releasing magnesium gradually over a period of about 20 to 21 days. Key points about a magnesium bolus for cattle:
- It contains a high content of magnesium, often in forms like magnesium oxide.
- It is used especially during grazing periods and peak lactation when magnesium deficiency risk is higher.
- The bolus is administered orally using an applicator, generally given a few days before cattle go out to pasture.
- It helps maintain adequate magnesium levels to support bone growth, nervous system function, and fiber digestion.
- Typically, one bolus lasts for about three weeks, and re-administration can be done as needed.
- It is an easy and effective way to supplement magnesium without daily dosing.
The purpose of the magnesium bolus is to provide a slow and steady supply of magnesium to prevent the symptoms of magnesium deficiency in cattle.
