Mayo All Guard Ewe 4 In 1 BolusHigh cobalt multi trace element bolus for ewes and rams. Can aid with: Improving conception rates Improving milk yields Utilising grass more efficiently Improving lamb vigour at birth A slow release bolus containing, cobalt, iodine, selenium and zinc. Delivering all the essential trace elements crucial for the key periods of lambing, breeding, growth and thrive for 6 months. Long acting & highly concentrated Containing cobalt, iodine, selenium & zinc