A few months back I bought a Svart Roo and some 55 Flowery Hens..well, birds being what they are, they did the deed in quarantine and I wound up with some crosses. Its been interesting, they did auto sex (like the 55 Flowery is known for) boys having the white/yellow dot on the head. One came out of the egg full on looking like a 55 Flowery female but over time is coloring more and more black. The cockrels are looking like Bared Rocks at this point and the pullets are well, doing strange things. I have another set that is about 2 weeks old following this same pattern. Females have the brown heads and the males are already getting white 'darts' on them.