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Though I'm sure there are those that would argue differently, the large hatcheries are not IMO humane in how they treat the chicks, especially the excess baby roos. I'm not sure how you could find out if the breeders the hatcheries get their eggs from are humane or not. It would make sense to me that they would treat their breeding flock with good care, since they are their bread and butter. Still not sure how you could know for sure.
If it is of upmost importance to you, you might try locating a private breeder that has the breed(s) you want and ask questions.