I am thinking of crossing welsummer roosters over araucana hens having the silver gene to create Red sex linked olive eggers.Which ever ones people use, different breeders can use different base genes. Most people use silver base for lavender, and always for silver duckwing if bred properly. For better color I think most use silver base for blue and splashes as well.
The problem is that the best and most secure choice for RSL crosses is the light columbian color pattern for the maternal stock.Hi Thomas, I don't know if this helps you at all, but this is an excerpt from our Araucana bible - "Rings In Their Ears":
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I don't know the genetics behind Welsummers, but if its similar to black breasted red I can copy the techniques suggested in this book for you. According to this book, in addition to the obvious silver and silver duckwing, golden duckwing, extended black and black mottled carry the silver gene. As for the crested araucanas, I am clueless about that strain, but for the rumpless araucana in lavender the book says pretty much what ChickenLeg said.