THE BLUE GENE
The Blue gene is an incomplete dominant gene which means that if a bird has inherited one Blue gene from one of it’s parents then it will be Blue but if it is pure for the Blue gene and has inherited two Blue genes ( one from each of it’s parents ) then it will be Splash.
So Splash is actually the pure breeding form of Blue and therefore will breed true so Splash mated to Splash will always breed Splash.
Orpington’s have an established required Blue shade that the dedicated breeders have perfected but in other poultry Blue can be anything from a very pastel powder Blue through to a dark Blue Black.
It is believed that the more Black that is present in the genetic make up of an individual bird the darker the shade of Blue.
Breeding Blue Orpingtons is fascinating and producing the correct colour is an art. It can be achieved several ways:
Black x Blue = 50% Black / 50% Blue
Blue x Blue = 25% Black / 50% Blue / 25% Splash
Black x Splash = 100% Blue
Blue x Splash = 50% Blue / 50% Splash