I have put out the wind Rain mineral with the fly control from tractor supply. The reception has been great, however I can't tell who is getting it and who is not. I put out about 3 to 4 pounds every morning before I go to work and when I come in fro work the trough is cleaned out. I have it near the water tubs so as to encourage them eating it. How much should they be getting? There are at the time only 8 grown cows in the pasture. They are still getting hay and grazing pasture. Can any one get to much too much of this mineral or when their system gets full do they back off of it, or do they just eat it until it's gone?