Some people tend to make the feeding process more difficult than it really is, at least that's what I think. If you want healthy chickens that can lay and produce to their full potential (Ones that do not have great range, for example) then why not just stick with the average chicken layer? You can always supplement with leftovers, greens, and proteins like meat, and you'd be set. If yours have great range, with access to a wide variety of plants and insects, then I'd see no problem with feeding a *good* quality of scratch as a staple. I'm by no means an expert in this subject, but mine seem to do great in a 1/2 an acre back yard, with a good variety of plants, some bugs, and regular 16% layer. My yard is green 24/7 in florida, so no veggies are given to them, and they are let out 1-8 hours a day if weather permits. For treats I give them a handful of black oil sunflower seed 3 times a day, yogurt once a week, and feeder insects several times a week. It can be as complicated or as simple as you want it to be, but it just comes down to how well the hen produces FOR YOU.