Around the beginning of March we start feeding minerals with IGR, we also have oiler/mops at the entrance to the waterpoint so the girls have to pass through them to get oiled up. The mops have Permectin and deisel. When we work them in the spring we pour with UltraBoss, that provides a residual till the IGR really starts to work. We hang the mops low enough that even calves walking through will get mopped at least a little.