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The color in a millie is produced by the interaction of the columbian gene, the sex linked gold gene and the dominant wheaten gene. Darker ( as in more eumelanin or black pigment) colored millie are most likely brown and not wheaten. They also carry the mottling gene.
eWh/eWh , Co/Co, mo/mo, s+/s+ or s+/_.
e+/e+ wild type and eb/eb will also produce a millie
mille fleur on mottled = mottled offspring
You will have to back cross the millie roo to the offspring to get a bird that looks millie fleur. The birds will be smutty black so you will have to back cross the best to the roo again. If you hatch enough birds, you should get some descent mille fleur. You could back cross again or cross the best offspring to improve the mille fleur pattern.
Tim