A dietetic feed for the long term supply of breeding cattle with trace elements. A sustained release bolus containing iodine, selenium, cobalt and copper. One bolus will give breeding cattle over 400kg liveweight full trace element support for 180 days. The unique controlled erosion technology releases precisely the correct level of trace elements at all times, making it the smartest way there is to protect fertility and calf health. To be used with applicator AGR0200.