Thanks for the great comments. We use soy-free organic starter feed and layer feed from a local supplier, Scratch-n-Peck. I thought about simply mixing the two feeds together along with oyster shell and chick grit and putting it all in the treadle feeder and see how it goes. I heard the pullets trigger the treadle door yesterday, but it scared them off and we probably let the layers in too soon for them to figure out there was food in there. I know they'd get hungry enough to figure it out very soon, but as of now they're too scared of the layers to get near it when the big girls are around. Any thoughts on that idea?
Our run is about 60 feet long, but only about 4 feet wide for most of it with a 8 x 10 square at the end opposite the coop. There's not a lot of room for escape so the layers can corner them readily. The layers don't appear to be super aggressive, but clearly territorial and want to serve notice that they're boss. I'm not sure they'll let the chicks up in the coop at night until they're a lot more comfortable with each other, but we've been giving them some time together this weekend. For two+ weeks prior to that, the 5 chicks have been in a brooder with a small run next to the main run to get them somewhat acquainted with the layers. However, they've now really outgrown their little 28"W x 24"D x 24"H brooder, so we moved them in for a few hours yesterday and starting a couple hours ago today. It'd be sad to see them go, but we're prepared to sell the layers (10+ eggs a week from the two of them) if we don't see progress in them sharing the space.
Any suggestions as to steps to take in this attempt would be much appreciated!