Want to get rid of flies on your cows, then this is the stuff to use. Recommend to me by another farmer, holy "cow" this stuff works. With in minutes the flies were gone. They went from 50-100 flies to 1-5 in short order. It has remained this way since application. Give it a try. My farmer said 30ml which is double the Recommended dose, but you put it on alot less. Try it and like it.