I figured this would be the best place to stick my question. I live in northern MN....its been COLD here. I have 3 heat lamps plus a space heater in my coop. I switched from 16% layer to 21% all flock. Plus BOSS, fresh greens (3-4 times a week), squirell corn on the cob, plus a tray of calcium/ grit. They also go through 3 gallons of water in a day...sometimes more. I have 15 hens and am going through a 40 pound bag of feed (divided into 2 feeders), a 10 pound bag of BOSS, plus the greens in two weeks. However when I did my biweekly chicken feel up tonight I noticed that at least 5 of my girls have a pretty pronounced breast bone hiding in thier feathers. They are not nearly as plump as I think they should be. My egg production has been down, but I thought it was a) winter, b) the cold, and c) most of them are young having just started to lay around Thanksgiving. Today we switched them back to layer feed that is made here locally it has crumbles, cracked corn, oats and a few other goodies in it. What else could be causing this or what else should I feed them. This is a new flock this year as predators got last years flock, but we didn't have this issue last year. I am thinking about fodder but would that help? And what would be the best thing for them? I don't feed any meat products as I have heard different things about that....should I and if so what? Would a second round of deworming be in order? I haven't seen any parasites but that doesn't mean squat really. Should I move the girls into may basement for 2-3 weeks after. Giving everyone a good bath with puppy flea shampoo and deworming again. Thanks for any input. Like I said they just to seem to be right to me....However they do appear to be eating and drinking okay.