As for the heritage or purebred chicken deal, I would rather just have something that was bred for a purpose selectively, than to have an animal that may have all or none of the good things that Im looking for. Although its not guarantee that chicken breed A will do what I want, it is more likely that an australorp will lay brown eggs of a medium large size than (chicken a) x (chicken b x chicken c). Many people compare purebred chickens and other animals to purebred dogs but that is not what I want to get into at this moment. The only eggs dogs lay are brown and you have to pick them up or get a ticket.