I tried a very simple version of this last night and it didn't work so well
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I was thinking not so much of brooding littles, but to put in the grow out pen so I can move them out sooner. I've got a batch of chicks in the brooder that are 4-5 weeks old. they're sex linked, so I decided the cockerels would make great test subjects. I've got eggs heading for lockdown today, so was wanting to move the bigger chicks out of the brooder if possible.
My brooders are galvanized steel tubs, in my uninsulated, unheated garage. Not sure how low the temp gets in there at night. I think outside temp was in the high 40s last night.
My wool hen was very simple. A cardboard box, just the one layer. I cut strips of fleece, couldn't find wool. Hung them pretty dense, I thought. I'll add pics from my phone here soonly.
Put the 3 cockerels in a brooder with no heat lamp, just the box. Had to go out and put them IN the box after dark, but that's understandable. They've been raised with a heat lamp.
Went out this morning and removed the box. 2 cockerels were huddled together, very puffed out and cool to the touch. 3rd boy was apart from them and not doing great, very puffed and lethargic. I moved them all to the brooder with the heat lamp. The 2 recovered reasonably soon. The 3rd literally fell on his side and wouldn't move for a good hour or so, then stood hunched and puffed up at the edge of the heat lamp. I finally moved him closer under the heat and about an hour later he was moving around some on his own.
I'd thought since these chicks are older, it might work. Not so much.
Ideas to try-----insulating the box is my first thought. I'm thinking just to put it inside a larger box and stuff with newspaper or Styrofoam, etc.
Maybe 3 was too small a number of chicks? maybe more would have kept each other warmer, I don't know. I just wasn't thrilled about risking my for sure pullets
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I could try adding more strips to the box, and see if that would help hold heat better.
For littles, I would cut the edges of the box down more, so the strips are in better contact with the ground. I may give that a try also, although I don't think that would have been an issue.
Welcome any input.....