Ok, thanks- that's what I was asking. If a mother can only pass barring to her sons, then my hen(s) parent's were Barred Rock Roo crossed with a Buff Orp hen, not the other way around. They were bred with a pure Buff Orp Roo. These are the babies they produced: (None have spots.)Nope! If the hens were barred, the sex linking should work. It works best on a black background because it's easier to tell the difference but any barring should work. Males hatch with a white spot on their head, females without. Males will be barred and females will not. it works because a female barred bird has only one copy of the barred gene and she can only pass it down to her sons.