Blue chicken breeds are peculiar because of the color of their plumage and the genetics behind it. To get only blue chickens as offspring, you have to breed a black chicken with a splash chicken.
BLUE ANDALUSIAN
The Blue Andalusian has a slender body and beautiful plumage. It is a decent egg layer, you can expect about 150 eggs in a year.
BLUE COCHIN
Cochins come in various colors including blue, black, and buff. Blue Cochins do not lay as many eggs as their ancestors.
BLUE PLYMOUTH ROCK
You can get about 300 large brown eggs from a Blue Plymouth hen in a year. Adverse weather, such as cold weather, does not hinder their egg production.
BLUE AUSTRALORP
Blue Australorps love foraging. You can expect about 250 large brown eggs in a year from a Blue Australorp hen.