We have 2 chickens who are semi retired. They have been using treadle feeder for years. We just bought 2 new 18 week olds to help with eggs. We have propped open the feeder to show them where the feed is. Haven’t seen them go to it yet. It’s been 5 days. Have put some pellets down which they eat but don’t appear to be starving. But we gave them some bread today that they pecked until they lifted it off the ground and they were scared. They don’t go near the feeder. Worried how to train them.