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I'm sorry, that sounds like factory farming/broiler houses to me. Are those numbers correct? Are those mature, full sized birds? Something is not adding up here to me? I have a 10 x 12 coop with an acre of pasture, currently with 50 birds a third the size of a Dorking, and they seem horribly overcrowded to me. I'm not sure how they can stay healthy in those conditions-maybe Dorkings are tougher than my breeds, but mine would be sick, stressed and quality, fertility, etc, would all suffer if I did that. I've always heard 3 sq. ft as a minimum for healthy large fowl, so, I can keep 40 birds in my space, in theory, but, in practice, I like it to be only 20 large fowl in the winter. I'd love to know what you are doing to keep your birds alive, mine would be dead I think if I crowded them that way. Are your numbers a typo? Maybe the breed is that tough? Just wondering?
Well, yes and no. The dimensions I gave you were for my general layer flock, which are not all large fowl (various breeds) and are only in there for the duration of the winter. I do not add heat in the winter, and rely on only body heat to keep the coop comfortable so there is no wasted space. I personally have a hard time with the whole "square foot per bird" thing. When it comes to COOP space, you only need enough roost space for each butt that will be sleeping in the coop. Have you ever seen the birds sleeping? Head-to-butt, right next to each other, and my birds are only in the coop when they're laying or sleeping. My coop is all roosts, with one wall of open nest boxes (no dividers). As for the runs, give them as much space as you want to. But I don't have room for a 200x60' run., nor do I have an acre to free range. I do not have any symptoms of overcrowding with that size coop/run, my birds are very healthy, happy, and I've been told many times that my coops are the cleanest people have ever seen. I WISH I had an acre to pasture them in, but an acre for 50 LF birds (IMHO) is not crowded in the least. I have to keep everyone in a covered run due to predators (eagles, owls, hawks, bears, lynx, yada yada). In the spring, half of the birds will be sorted out into their breeding pens in the breeder coop. Sure, with that many birds in one coop, I have to work a little harder to keep things clean, which I do. The "4sf" per bird is the total space, coop and run. If I take the entire run, plus the coop, I have 448 square feet. Divide by 4, and that's 112 birds. I don't have nearly that many birds.
If you go by the 4sf rule, a 200x60' space could hold 3000 birds.
Edited to add that I type slow, and y'all figured out all that stuff while I was typing...
LOL!