Corn is around 8% protein and mostly carbohydrates so while its a good late season/winter food draw its not a good protein food for growing giant racks. Corn matures too late in the season to provide much for growing a bucks rack. Minimum protein intake, during the antler growing period, needs to be 16% and above to generate really trophy racks. Corn does provive a good thermo break in hard winter, if left standing. Other food plot plants can generate up to 38% protein coupled with excellent genetics makes a good combination to produce big guys to pursue.