If you ever come across a comparison of whole corn versus DDG for feeding, I would appreciate the link to read.
I’m not so good at posting links, but if you were to Google on “ruminal acidosis” you should find several explanations as to the health risks to cattle and sheep from high starch diets. There was a University of Nebraska study from a few years back that you will probably find by searching on “feeding of corn milling co-byproducts to beef cattle”.