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Well the layer feed is designed to be the only feed. 16-20% protein is the standard recommendation for layers- of the total diet.
On BYC I have read that you don't want treats to comprise more than 10% of the diet. Here is the treats chart...
Corn is around 7-8% protein. Layer feed is around 16% protein. Eggs are protein. So your egglaying might be affected if they are not finding a lot of protein elsewhere and they receive too much corn.
A handful of corn thrown out everyday is nice, IMO. Just enough for them to get a little bit...