You would then do your silkie roosters over the F2s to bring it back to the silkie body type. There will be many many crosses and cross backs to set what you want.That’s true - any other combo will only yield 50% chance of blue eggs I should probably do that and then test and keep birds that both have blue egg genes. However that will take the birds more towards the ameraucana bantam side, and not silkie. But maybe I should give it a try. If this black cockerel matures first, even though I don’t really need him, maybe I should just let him breed when he starts and hatch out those babies and only keep the very best ones.