People will call my bluff but we have not used a lice pour on here for 5 years. Instead we clip everything. 4 runs of the clippers - 2 each side of the back bone. It takes about 40 seconds per animal. We have had no scratching, no hair loss and little expense with the clippers only costing €70. I don't know why it works but it does. Vet was here one day and commented that it's because lice live across the back bone because it's the warmest point in the cattle body. removing the hair removes the lice.