Your points are taken.
The article I read about the corn fattening rotation was saying that the nutritional value of eating the whole corn plant, leaves and stalks, when it was young was similar to a cow eating a fescue or other grass. In the article they started the rotations when the corn was very young, about pasture sized. He also planted it broadcast like a pasture, eliminating cultivation rows. You could supplement it by interplanting peas or another legume with the corn. At any rate this method would only be used at the end of the process, with regular pasture being the main component to raising the animal from birth to a fattening age. I understand about the majority of farmers using the silage - I am just trying to save the labor again.
I know that corn fattening is hard on a animal. I am just wondering if eating the whole plant, not just the seed, would make a difference. If not corn then why not a planted field of another grain used in the same manner and finishing when the seeds are ripe on the plant. Like eating grain and hay combined.
In the olden days they planted oats and peas in combination with the sole goal of making, what was known then as, oat hay. It was carefully harvested when the grains were almost ripe and fed to the cattle in the winter. Could a similar planting be used as the standing hay crop?
Just being the devils advocate - asking a lot of questions to think about. I also agree Salatin seems to have the best tested ideas around.