Thanks, guys. Sure makes it fun when you can visibly SEE the difference a good mineral makes.
John, if you are feeding those calves corn, there is alot of phosphorus in corn. So you could feed the calves 35SPL. It is cheaper, has less phos and the calves will eat it better. Cattle won't overeat phos, it is a limiter like salt. And the PLUS means it has more trace minerals than the 'S' products.
Denny, start the IGR when you have a few days of 60 degree weather and feed it through to the first frost. It won't get rid of all the flies (we never will get rid of all the flies) but it interrups the life cycle of the horn fly, which is the one that does the most damage, economically. It will cut the number of horn flies down so they won't cause the cattle to bunch during the day. Horn flies are what cause cattle to bunch up. When they are bunched, they aren't out grazing and when they aren't out grazing they aren't gaining weight. Here is a little example. A neighbor wasn't feeding IGR and we were. I came home from town and noticed his cattle on the left side of the road all jammed up in the fence corner. Five miles down the road, our cattle were on the left side of the road and they were all scattered out grazing.
And you are right on about the cows 'catching up' on the mineral. Also, if they should keep eating it at that rate, put out salt or up their hay a little. Sometimes they do that if they aren't getting enough dry matter. FWIW
(The product you are using doesn't contain much salt. Loose salt is best and don't mix it, put it in another tub. Hope this helps!)