Do they breed true?
Nope. You have to create them each time from the same "parent stock".
I am sorry, I was on my Phone and I do not type well on it.
I did not mean why the blue birds, why do you consider the autosexing a plus?
To me the autosexing is not a plus but a negative.
Autosexing/sexlinked is a plus at homes where you can't eat the boys

Quote:
So sad a perfectly good egg was not eaten for breakfast! I don't eat eggs that have no shell, too much chance of bacteria getting inside the membrane.