As I said, different hatcheries can have different policies. I can't speak for all of them any more than I can say that every cop in the world is a bad cop or every school teacher in the world is a good school teacher.
There are a lot of downsides to them mixing in a different breed, even a...
Each hatchery has its own people deciding which birds get to breed so you can get differences from that. Each hatchery has its own business practices so there can be differences in what they do. But most follow a certain general practice. Most of the people selecting which chickens get to...