A sustained release bolus containing six trace elements and three vitamins. Designed for grazing or forage fed livestock with a liveweight over 150 kg where an imbalance of iodine affects animal productivity. -® helps farmers manage the trace element status of their herd over critical periods of the production cycle. Low levels of iodine in pasture will generally result in low levels in cattle grazing or being fed forage from that pasture. The use of lime and manure spreading can greatly reduce the level of available iodine found in pasture. Low iodine in the blood can result in poor growth rates and milk yield can also be less than expected.