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I don't know but perhaps it has something to do with getting them to gain the most weight. If they're expending too much caloric energy running around they'll make a lighter carcass when butchered.
This may not be a factor with your own small flocks of backyard meaties, but if...
Please make one just like it for me!
But really, it's really really nice. And it will hold 100 birds? What dimensions would you need for just 25? Or 50? And where/how will you provide food/water?
Enjoy all the tasty chicken dinners you're going to get from your efforts!