The Barred Rock hens (mated with a solid color orp roo) can only pass the barring on to her male offspring. In other words, you created sex-linked chicks. If you're right about the parents, then the black ones with head spots should be male, and the solid black ones should be female. This only works for the 1st generation & also only if you're sure the parents are purebred. (Ie - EEs are lovable mixes, so you can't be certain of what's in their genetic mix.) Also the lav color can only be passed on if both parents are lav. If only one parent is a lav, then the chick will look black but can carry the lav gene. (exception is if the other parent happens to carry a recessive lav gene.) Hope this helps.
Of course all chicks are cute, so congratulations on your latest hatch!
Of course all chicks are cute, so congratulations on your latest hatch!