This is not intended to be an insult, nor is intended to be unkind, but people who are suffering 30% losses need to really reevaluate their methods of raising, their facilities, and their feeding practices. I don't think that the problem is the breed of chicken.
Once the chicks are in your hands and the post office hasn't killed them, you should not be losing chicks.
Once the chicks are in your hands and the post office hasn't killed them, you should not be losing chicks.