We’ve had problems with coccidiosis for the past few years. We have more than 750 Lleyn ewes, but had to hold back more than 10% of ewes from going to the ram as they were suffering from coccidiosis, with more than 1,450 oocysts per gram (opg) in a faecal egg count. Growth in finishing lambs has also been inhibited. What is the long-term solution as I’m convinced the sheep pick up the microbe in the grass?