I feed Nutrena Nature Wise Layer 16% pellets. I am new to chickens. Do I need to feed scratch or corn? I feed them Nature Wise scratch in the yard or run. They get about 3 cups of scratch for 25 chickens. Is corn better than scratch? What is the diffrence in them? Also when is it best to feed that or is all year okay? They have free choice of layer,oyster shell, grit and clean water. Plus what ever they find when they get out for a few hours a day.