With all the flap about getting milk directly from the farm(er), I would recommend you NOT contact your extension agent. It is a VERY hot topic here in Wisconsin. Since I was not in charge of nutrition when we had the dairy herd (SU was, I did the milking) I can't say what was in the mineral pack we added to the TMR. But, I know that iodine is a necessary element for health. Probably a trace mineral/element, like selenium.
