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A White Leghorn would be one of the parents in this cross, ( Thus the dominant White color) so they wouldnt be color sexlinked. If they are sexlinked then they would be feather sexed from a Rapid feathering White leghorn rooster on a slow feathering hen strain.
But they may not be sexlinked at all. They are similar to the Austra Whites that Cackle is selling this year which is from a Black Australorp roo on White Leghorn hens, which would be just a production hybrid and not sexlinked.