Stigma on Colors of silkies and a little genitics

[Fancie]

How many Generations need to pass throwing the same color before the strain is pure again? or is it never pure after you throw a new color in the mix?

 

[Sonoran Silkies]

Well, if we could do DNA testing and ascertain that the bird had the correct genes for the variety, and that they are homozygous whereever possible, that is all you'd need

Unfortunately, the technology isn't there, and the cost is prohibitive to all except possibly Bill Gates.

There is no "correct number of generations." Silkie breeders are about the only ones who throw a fit when a bird doesn't breed true each and every time. Those who raise other breeds expect some surprises and sports.