We have a flock of non-laying, older hens. They haven't layed well in a couple of years, and the feed we have been giving them (layer crumble) is getting a little too expensive. There is NO WAY we are going to get rid of them, but they need a new feed. What can we still give them for nutrition that doesn't cost so much? They don't need all of the extra nutrients for laying, and they're free range grass. Can a simple scratch mixture supplement their diet or do they need more? Thanks!