in the summer, my chickens would leave whole corn on the ground uneaten. of course all summer they get bugs, garden waste, and layer pellets. in the fall when they moult and egg production drops, i feed them whole corn and sunflower heads. most of this is gmo dent corn. they love it this time of year and the colder it gets the more they want it. i also grow heirloom varieties of popcorn, black sorghum and turnip greens which i feed until late december. at that time i use a five grain scratch that also contains whole corn. this increases fertility in the cocks. it is called 'rockin rooster'. the other cheaper scratch feed that contains cracked corn and wheat, they don't get excited about at all. then in january i usually go to the layer pellets exclusively until summer. whole corn is great if you know when to feed and keep in moderation. i would use it over cracked corn anytime. it adds fat and keeps chickens warm in my opinion.