Quote:
Depends on what you are working toward. Do you want pure black? Your black pullets from the Birchen Cuckoo cross will still be half birchen, because the black from the cuckoo is dominant it won't show. Breed them back to the birchen, and you will get pure birchens and split birchen/blacks again. But, your barred roos from the sex link cross will only carry a single factor of barring. Cross them back to your cuckoos, and you should get some black hens, some of them should be pure black, some will still carry birchen. One in four will be black, one in 8 pure black with no birchen.
Cross these hens back to their father and you get a pure black rooster, also one in 8.
Thanks the Birchen is from a very dark egg but a split silver/gold I might try a project with my cuckoos from the darkest eggs I have some that lay a 6.....that might be a worthy black I first want the egg color I'm saving your cheat sheet thanks so much...... I have some Silver Birchen eggs on order who knows what the color will be.......