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feeding only wheat is definitely not enough! not only is it boring for the chicks, but it will cause severe nutritional deficiencies that could kill the birds (or at the least make them terrible layers or not worth eating).
wheat will probably be the largest part of your mix, but wheat alone (really any one ingredient) doesn't provide all the needed amino acids, starch, vitamins, etc, that your birds need. just like us, they need variety to their diet to get the essential building blocks to grow.
also, some recipes, and most commercial feed, include soy. lots of people still think soy is wonderful, and it is really high in protein, but it's been linked to all kinds of health problems in people (if your birds eat it and you eat their eggs or meat, you eat it) such as hypothyroidism, cancer, and loss of estrogen production. i don't feed it to any of my animals. flaxseed is a great alternative, or even fish oil.