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Opti-Mag 3 boli are moulded metal cylinders containing 100g of magnesium, weighted with iron shot.


Opti-Mag 3 boli are indicated for use in adult cattle as an aid in the maintenance of magnesium intake during the high risk periods associated with the grazing of rapidly growing grass, by the provision of a slow release depot of magnesium.

Dosage & Administration

Two Opti-Mag 3 boli should be given to each animal two/three days before the expected period of risk e.g. before transfer from indoors to grass in the spring. If necessary repeat no later then four weeks.

1 bolus delivers 3g per day
2 boli deliver 6g per day

Only to be given to cattle at least 300kg bodyweight. Administer orally by using the specially designed bolus gun. Load the gun by inserting the bolus into the open end. Open the animals mouth and the gun should then be introduced carefully and gently until the bolus is in the region of the back of the tongue. Severe pressure on the tongue should be avoided.

Depression of the plunger will deliver the bolus onto the rear part of the tongue, thereby intiating a swallowing action. The gun should then be carefully withdrawn from the mouth. A second bolus should then be administered following the same procedure. Observe each animal for a short time after administration to ensure the boli have not been regurgitated.

Contraindictions, Warnings etc

Opti-Mag 3 boli are recommended for the use in adult cattle only, when grazing rapidly growing grass within a well-defined period of high risk.

Consumption of more than small amounts of other feeds (e.g. hay, silage, concentrates) may, by altering the pattern of rumen fermentation, change the rate of release of magnesium from the boli. The bolus may more readily reach the reticulum or base of the rumen if it is not given immediately after the feeding of hay or silage.
Opti-Mag 3 may occasionally be regurgitated. If it is noted that an individual animal had regurgitated a bolus, administration should be repeated.

Pharmaceutical Precautions

Store in a dry place.

Further Information

Each Opti-Mag 3 boli contains 100g magnesium with a slow magnesium release mechanism.


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