Right on base....record keeping is paramount for a breeder.In my opinion, breeders of any breed of chickens keep records of pedigree so they can look closely at what particular crosses produce.
This allows two courses of action - 1- if they don't like what is produced they don't repeat that cross again. 2 - if they do like what a particular cross produced they know how to produce more.
Please corrrect me if I am off base.