Insects are certainly the best forage for chicks. It does not take long to deplete the population in an area. I can't depend on them. I only have a couple acres.For chickens I suspect most of the forage protein would be coming from insects that live in the grass rather than from the grass itself. (Grazing mammals would be a different story.) Sand ridges are tough. I'm in a desert. My yard is pretty much devoid of plants and insects except where I have things on a drip system. With water bills already $100/month or more I'm not planting any fields of forage. The compost pile, mesquite tree litter, and garden beds produce a fair number of insects, so my small flock has something to browse on and hunt in most of the time. Much as they dislike the summer heat they really enjoy the July-August rainy season insect feast. We have several really short seasons, so it's hard to figure out how to time things.
Sarah
I lived out your way for a year (almost). I love it out there. I lived outside Phoenix and spent my weekends climbing around the Superstitious Mountains. The Sonoran Desert is beautiful. I also used to go out that way every year. I had more money to waste then. It is a special place. One day I hope to go back.