Thanks, sounds right. I raise Splash Marans so understand the B/B/Sp, but the MF part is what is new to me. As you say, that doesn't change the B/B/Sp. issue. However, a true MF is a gold-based bird, right, like a d'uccle? A Speckled Sussex, for example, has MF patterning, but is a mahogany based bird, which is what most MF Cochins seem to be that I see presented as MF: is that correct?I think the issue here is understanding how the blue gene works. It, like chocolate, is a dilute of black. If you breed blue to black you will get some blue and some black and sometimes splash (sometimes called a sport which appears to be very white with splashes of blue) but you will never have both blue and black feathers on the same bird. Eta: you may have some feathers which are very dark... But when you look closely it is still blue. Our monitors and cameras can sometimes miss the subtle differences.
I have seen this before in birds where breeders were thinking they had a recessive chocolate bird when, in actuality, they had a combination of brown or partridge genes as there were both choc. And black feathers on the same bird.
To me, The pullet you posted clearly shows a black Mille fleur type pattern. Her hackles are obviously black. Now looking at this younger picture of your cockerel, his tail does look smokey blue but I believe there are other genes mixed in with him to create this smutty look (lemon bras siness). that makes it hard to tell. And that's been a huge problem with the creation of this variety ... Who knows what the heck colored birds people tossed in the mix to make something pretty and sell as "calico" or "Mille fleur".
Anyway, ignoring pattern quality for now, you are correct with the photo/computer quality situation. My Ricky doesn't have black on him and all his under-down is a grey/blue color, as I tried to show in the juvenile photo. The bird posted in #8008 looks like mine, but with a more "mottled" chest, and it has mahogany hackles instead of the gold hackles that Ricky has. They are all pretty, but I have yet to figure out what a standard should look like, besides for the basic (mahogany-bsed) MF Cochin.
This is maybe five months ago. Ricky is just 1 year old this month. Whatever he is, he is a handsome guy. Even my meanie Penedesenca loved him!
As pullets last September: Ethel: Calico Lucy: Regular MF (But Incomplete--not full pattering of MF)