My flock would go through two feeders a day when it was cold and they were locked in the coop. As soon as spring hit and I opened them up to run free on 3 acres, I add a little 16% layer mixed with cracked corn and oyster shell every morning. Their feeders never empty out. They have, however, eaten and ruined all of my big hosta plants in the back yard! Oh well, chickens are a lot more fun to watch than hosta anyway!!
