@Kev
I was reading it in a thread here on back yard chickens.
"Anyone Else Breeding for Opal". I think is the thread name.
Thanks and yeah it's the same new mutation color. So far everything I have read/remember points to it being a simple recessive.
as for below... this is from memory from when the Opal was "announced" and interest was high.. then radar seems to have gone silent since then. Maybe it's still discussed in the OEGB circles but that's a breed I simply have no interest in so I don;t wander into those areas at all.
To breed for Opal NN you would have to get opals or opal carriers as it really seems to be a truly a new mutation(although some are saying the same color was present in some European breed, I forget which one). To get the same Opal color, probably best to breed with solid blacks as it appears to alter the black pigment....
I have no idea what opal does over other colors as I have not seen any one crossing it with other colors AND describing or showing pictures of the results. Kind of some talk but not much walk. So I haven't seen any information on how Opal deals with red/gold pigments or other mutant diluters like blue, chocolate etc.
There *may* be some evidence it is a mutation that happens to be at the same location as the recessive white is located at. So avoid breeding with recessive whites otherwise you might get lost as to which chicks are Opal or not. I can't remember if Opal is dominant or recessive to recessive white.
What that means is if you breed a pure Opal or recessive white to a black chicken, you get black chickens because both are recessive genes. However if both opal and rw really are located at the same spot on the chromosomes... it means you potentially get a different result by breeding Opal with rw(and this is proof of them being what's called "alleles"- different gene variations that share the same spot- the human blood ABO being a good example). I can't remember if recessive white is "dominant" over opal or vice versa. It might have been proven or disproven since then, btw so if you see new info I'd love to know of it..