I think that most people would agree that feeding corn to growing calves is fine. After all, right now corn is cheap.
Feeding corn to cows is a recipe for disaster.
I posted on here about the cow calf pair I sold to the novices last year, well I promised them that I would take them back to breed them this summer. The cow is now the single fattest animal I have ever seen. She has a watermelon for a brisket and No visible tailhead. BCs 1000.
I asked them if they had been feeding some grain. Just for treats they said.
Will she breed? I doubt it.
Bag feed costs .12 per lb. Bagged corn is .10 per lbs.
Shelled corn from the elevator is .15 over market in your gravity wagon. That is around .06 per lb. Grinding adds a little to the cost if you want to do that. Might be worth getting a used gravity wagon at a farm sale. Might approach a grain farming neighbor with a feed grinder and ask if he will sell you some corn and grind it for you for even less money.
Well managed grass with clover in a pasture rotation is probably the cheapest way to go. Frost seed the clover, if you don't have any and make sure that your pH is approaching nuetral. No N needed.
Our cows are on Cells for 3 days and then they go to the next cell. There are 10 cells. Each cell rests for 30 days. Even in last years drought, we didn't feed anything.
Corn to developing heifers in the form of creep feed or too much after weaning. (More than 3 lbs.) Will cut down on your future milk production.
So, I guess it depends on where you live, and what you have available. Corn is cheap, depending on whether it comes from a sack or out of a bin. Which I think was CB's point.
Our cows do get some grain on the ear when they hit the harvested corn fields in the fall. Not as much when it was run by a late model JD combine though.