Corn grain is not a nutritionally balanced complete food for deer (or cows). Never was, never will be. It is a high energy food, like us eating mashed potatoes. Deer are free ranging, so they can eat a variety of foods (when available) for proper nutrition. That said, here is a link to U pf Wisconsin silage trials from 2008 with nutrition test values for various corn hybrids, with different genotypes.
http://corn.agronomy.wisc.edu/HT/2008/2008Text.aspx