I've picked up some rescue chickens (the lady didn't want to deal with them anymore), 12 hens and a gorgeous 'roo. She thinks they are 3 or 4 years old. I got a big brown egg today from one of them today. I don't want to cull anyone if they are still producing eggs. Any suggestions on how to figure out who is still laying? Can I isolate them one at a time for a 2 or 3 days and see if they lay? I have a couple of smaller coops I can use if this will work. Any other ideas? I know 3 are barred rocks, no idea on the others. Here's some pics of them if it helps any.