Cattle would need to run in the "Perfect" ranch country if they are never lacking for anything. Not saying it isn't out there,

but I haven't seen it nor heard about it. Til now.

Jon Patterson from MSU did a mineral study in Montana several years ago and it was ongoing for several years. His findings were Montana and Wyoming forage were lacking in copper and zinc; both are very important to a cow. That's why mineral is an important supplement. It fills in the blanks.

Plus the fact that different water sources contain sulfates which tie up copper and zinc and diminish the immune system.

That's one thing mineral about--enhancing the immune system so cattle can fight off disease.