had a lot of slateys out of one line of my family, Had one last season, however thought it was out of Lenny The Lions Family, as i broke out one of his pigeons and paired it to a successful line in our family, and produced a slatey, we do not house no slateys here previous to this, the little slatey topped the fed. Anyhow we bred from the fed winning cocks from this one line this season, resulting in 5 slateys. I know nothing of genetics, but all birds that produced these slateys were blue chequers.