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Rumbul Bullets for Cattle

Rumbul Bullets are an aid in the prevention of hypomagnesaemia (grass staggers) in cattle during the high risk period associated with calving and early lactation in the spring.


Rumbul Bullets are a guaranteed supply of magnesium during periods of high risk such as following calving and early lactation, during periods of rapidly growing spring grass or transition from dry to lactation.
They are NOT indicated for the treatment of clinical hypomagnesaemia.



Active component   

 Composition of each bullet

Magnesium 86%
Aluminium 12%
Copper   2%


Each bullet contains 40 grams of elemental magnesium and has an active life of approximately 28 days in the rumen.


Two (2) Rumbul Bullets should be given to each animal, two or three days before calving or at the anticipated onset of the risk period.
Always use the recommended Agrimin bolus applicator.
If protection is required beyond 28 days, a further two bullets should be administered.


10 Bullets  (5 doses)
10 x 10 Bullets  (50 doses)


Variations in the rate of breakdown of Rumbul bullets can be caused by variation in the diet.
Rumbul bullets are not indicated for the treatment of clinical hypomagnesaemia. They can, however, be usefully incorporated into a treatment program which involves the administration of other magnesium supplements. If in doubt, consult with your veterinarian.

DO NOT administer Rumbul bullets to cows that have received selenium pellets within the previous 6 weeks.


No withholding period


Registered pursuant to the ACVM Act 1997 No. A7797


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