Mogli, corn has 7 to 8percent protein not enough to make good egg production how ever I know some people that feed only corn and do fine. hens do not lay well in the winter when it is very cold because most of their energy goes to keeping warm. I don't feed extra corn myself but it is so cold I am thinking about going out and getting some. It won't hurt your birds and some breeds such as Leghorns lay well even in the coldest weather. what kind of hens do you have?