Opti Mag Bolus

These magnesium bullets are targeted at preventing hypomagnesaemia (grass tetany) in dairy cattle. They should be administered before the major risk periods of grass tetany. These risk periods include after calving when cows are grazing lush early spring grass. Use a suitable dosing gun to put 2 boluses into the back of the mouth at the same time. Take care during administration to avoid injury to the mouth and pharynx. Always ensure the animal swallows the boluses. Only to be given to cattle at least 300kg bodyweight.

• Contains magnesium for the prevention and treatment of cases of grass tetany
• Suitable for use with cattle and sheep
• Oral administration through specifically designed bulleting gun

These magnesium bullets are targeted at preventing hypomagnesaemia (grass tetany) in dairy cattle. They should be administered before the major risk periods of grass tetany. These risk periods include after calving when cows are grazing lush early spring grass. Use a suitable dosing gun to put 2 boluses into the back of the mouth at the same time. Take care during administration to avoid injury to the mouth and pharynx. Always ensure the animal swallows the boluses. Only to be given to cattle at least 300kg bodyweight.

• Contains magnesium for the prevention and treatment of cases of grass tetany


• Suitable for use with cattle and sheep


• Oral administration through specifically designed bulleting gun

Free delivery over €199 within the island of Ireland. Standard delivery is €8.99 under €199. Click & Collect is available from our Midleton warehouse. Bulky-item charges, where applicable, are shown at checkout.

Having an issue with a product? Contact our team and we will send you the warranty form and guide you through the next steps. Standard returns are accepted in line with our returns policy.