Fat Chickens Don't Lay Eggs

The chickens are not laying too well the last few days. They may be dropping some of their eggs outside so I will have to have a hunt around the barnyard and see if they are. I cut off their corn ration as of today as too much corn can also put them off their lay. It is ok to give them a little corn in the winter as it helps them with the cold weather but now that it is fairly warm I do not figure they need it. Fat chickens do not lay well.