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I myself like to experiment. I have a flock of Wheatens and Blue Wheatens who are pure Bev Davis, and a flock of Black Coppers who are pure Bev Davis. Then I also have a flock that is Wade Jeane x Bev Davis, and then another flock that is Bev Davis x Wade Jeane/Presley. (not my creation)
Through time, I'll be seeing who creates better conformation and who creates better eggs.
Personally though I'm someone who likes keeping true colors and true breeds, and I don't like mixing lines - But it does help, and it also helps you learn what could happen.
I'm not just for the egg though - To me, the bird itself MUST at least not be mossy, not have a squirrel tail, be of proper weight, have feathered shanks, not be blonde (for a Black Copper) not have brown in the chest (for a Wheaten) and so on. . .
Also, a Marans to me must lay an egg that is a 7 or higher on the scale. 6's are allowed when the cycle tapers. 5's are only allowed for "layer hens" - Those eggs will be sold for eating.