They could carry either allele. You would have to do a test cross to see if the specific bird is silver or gold. Spangling = dark brown restricted bird in true spangling. I am assuming the black birds are extended black at the E locus. Offspring will leak red or white color through black...
Quote:
If you crossed a porcelain roo with lavender hens, all of the chicks should be lavender. You should not have produced a black chick.
Is it possible that one of your hens is blue and not lavender?
It would not be unusual for the chicks from the cross to be a solid color. The birds did...