This kind of goes along with the Show Sheen and vinegar topic. What kind of home remedies and potions does everybody use to fight off the flies, mosquito's, and all other pesky critters on their animals?
Cylence is a pour on specifically for lice and flies. Label says its good for about three weeks. We use it mainly for lice, but it does help reduce the need for external fly sprays. I also put the insecticide ear tags in our show calves for the summer. I don't like using sprays anymore than I have to. I'll spray the barn more than I will the calves.