A white 175g bolus containing calcium, magnesium and phosphorus to reduce the risk of milk fever (clinical & subclinical) in cattle and can also be used as additional support following Calciject 40 CM infusion. Each bolus contains 45g of calcium and 40,000 iu vitamin D3 and has a combination of fast release calcium formate and calcium acetate and slow release calcium sulphate for a consistent calcium supply. One bolus to be administered at the time of calving and if necessary, 12 hours later.