Quote: it's quite possible, since the roo is not a deep mahogany, that he may carry the silver gene. it's also possible he only carries 1 copy of the mahogany gene, so any cockerels getting the silver without mahogany will look very much silver until they mature and the silvery areas would turn pale straw colored. but if he does carry silver, it's also quite possible to get silver pullets too, who would have red leakage because of the mahogany gene, if they get both. a hen can not be split for a sex linked mutation, since she only has one sex chromosome to carry the color on.
you are saying you're getting silver roos. have you grown any of them out to maturity yet? I'd like to see one around 6 months old and see what his color looks like then.
and I did look at Wilson's Wyandottes, if you look at his photo section, the blue partridge and the blue duckwing, both roos are heterozygous for silver. one just shows more red than the other. the blue duckwing has leakage on his wings and a pale gold/cream color where he should be white.
so yes, i'd say it's quite possible (probable) that he uses silvers in his crosses...
i'm also curious, looking at his birds, how much the Wyandotte SOP varies in his country from the US standard... those birds are not up to US standards, IMO. but then, they may be for his own country's standards of the breed.