It's hard to say they are so slow growing but yours feathered out very well for the breed some just don't feather out well until they are a bit older. Mine is still young, it will be awhile, are you worried about it being a roo because you can't have a roo? Maybe in a month or two take it too an old school farmer and ask them since they will have the bird in their hands it's easier to see. That's what I do anyways. But good luck very nice looking Jersey Giant.