I have a place that every summer I hate to have cattle on due to flies. I have had years that a white Brahman and Brahman cross cows would turn almost black on their shoulders and back from so many flies, and my poor Angus bull had even more than the Brahman cross cattle. I am always trying to fight flies with sprays, rubs and even tried ear tags a couple years and none seemed to work for very long or very good for me. But this year I have almost no flies, so far, :clap: only thing I have did different is the two people around in about 3 miles that have cows are using the fly mineral that you put out and I poured all my cows with Ivermicten about 2 months ago. I also have the fly mineral out Don't know if that has anything to do with it or if its just a off year so far but it is great right now.