agree with Donrae
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Agreed.Not technically a breed, although the hatchery probably claims it is. golden buffs are themselves a sex link, meaning they're a high production cross where the sex is linked to the color, so the chicks are sexable at hatch. Sex linkage is a one time deal, and you can't use a sex link to make a sex link (unless you want to get into more tricky genetics than this thread is geared for).
Even if these hens were, say, buff Orpingtons, there still would be no sex linkage in the chicks. Red/gold sex links require a gold rooster over a silver hen.