Just a little FYI. At our local co-op there are three types of supplement that fall under the heading of scratch:
Scratch grains - cracked corn mixed with oats and some seeds.
Mash - which is ground corn and looks very much like yellow corn meal. I've fed this by mixing it with warm water as...
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There's a reason they call it scratch. Just toss some on the ground for them and let them "scratch" for it.
As Digits said, they'll waste alot of feed if you mix it in. Continue to give the same amount of layer feed and use the corn as their dessert.