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Golden Neck is a color that is available within the D'Uccle breed. Just like Porceline, Mille Fleur, etc.
If you crossed them, the white would probably be the primary color that makes it through (it's dominant), with faded and incoherant spangling here and there (most likely will skip the black, the white will be lost in the white base feathers, and the red will probably be the secondary color that really comes out.)