My water fowl IE ducks and geese get corn regularly. they have a very high metabolism compared to chickens. They also have a layer of fat over there bodies that chickens don't have. They need the extra sugars and starches in corn to maintain. Corn for chickens won't hurt them but they also don't need it if your Pellets are good quality.
I little now and then is alright for a treat. They like it!
Chris They will do just fine if you are feeding corn. But cut it out and I'll bet your egg production goes up. I take it from your post you are raising Show birds? You should be feeding corn. It will put weight on them and help feather quality. The oils in corn will add shine to them.