Just don't look for 100% control. Been doing this for many years and have also been using the IGR for beef cattle since it was introduced. The more consistent the cattle are in their intake of IGR, the better the control. Doesn't take any extra labor as it is already in the mineral. I have read that if you can keep the fly population per cow below a couple of hundred per cow you are getting pretty good control, but ours rarely have an infestation that heavy. Fly tags are good for face flys but not very effective for others.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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