Just to revive this thread...I have a mutt who gives me wonderful speckled eggs. I can only guess that she's got RIR in her as she looks like one, not nearly as dark though. And she has white earlobes. The farmer we got her from says his chickens have been from RIR and leghorns. The eggs are a light brown with reddish specks. They're my favourite. I would love to know if you can breed for this trait, any more tips out there?