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Interesting. Are you sure? I don't have a strong background in the genetics, but it looks like silver and gold Cuckoo Marans are ER not E (extended black). See this thread: http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=94788&page=1. (You can ignore the photo posted in the...

I would guess the dot color difference is gold or silver gene. (There as gold and silver CM). You could theoretically use it in a (red) sex-linked cross, but it would be hard to get a reliable read on such a small area. Plus you'd have to be sure the roo was homozygous for gold. That said, if...