Right or wrong, I now feed 1lb per head per day of a 36% pellet that contains Monensin. As mentioned above, there's no way I'd attempt to mix it into the diet in it's concentrated form.

When I started this I left half the cattle on the regular 36% pellet without Monensin and it didn't take long to see a difference in bunk readings. My place isn't as precise as the bigger/better feeders, but I believe there was a noticeable difference in feed intake between the two pens on it and the two pens who weren't. Other than 8-10 fats a year that I keep on an "all natural" diet, I've fed it to all calves on feed ever since.