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Do you know if your roo was supposed to come from pure blue marans or blue copper marans? I have noticed that the blue coppers do get their neck feather coppering first and then start getting the back coppering. If he was a solid blue marans crossed to a blue copper or black copper, he may only get neck (hackle) coppering. If you cross him again to a blue copper or black copper hen, the next generation copper coloring will be better etc..