I know I've read that the crested gene is deadly if it comes from both parents. How do they keep them going when they sell them as a crested breed? Am I right that the crest is now available in most breeds? I just bought some Indian runners with crest,at least a few have them. If I breed the best topknot hen to the best topknot drake am I defeating my self?I have one excellent topped drake and one excellent topped he the same color,another drake only hs a small tuff and his two hens have none.these last three are a different color by the way. How would you pair them to get the best tops,color doesn't really matter to me??