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I belive Aina means sexlinks from crossing other colors of Marans roos on like Wheaten, BCM, Blacks, Blues, Birchen ect... on Cuckoo hens to make Sexlinked Marans. The Golden Cuckoos would be considered an Autosexing Variety instead of Sexlinked since they breed true to that trait.
Yes, I was talking about sex-links from crossing other colored marans on cuckoo hens. I'm not that interested in black chickens, but I do like blue chickens and blue barred for some reason fascinates me. So I was trying to figure out if there would be a simple way to get blue sex links or if I would have to cross several generations in order to get all blue (and blue barred) chicks. But the golden cuckoo are very interesting. I was going to ask if they bred true or if the sexability was only the F1's.
You could use Solid Splash, Splash Wheaten, or Splash Copper roos on Cuckoo hens to make Blue Sexlink hens and Blue Barred roos.
And yes, the trait in the Golden Cuckoo Marans should breed true as long as the roos are homozygous. But it my not be 100% accurate and may take some eye training. Even pure solid barred breeds like Barred Rocks, Dominiques, and Cuckoo Marans work like that most of the time.
Here are two Barred Rock pullets.
And here are two Barred Rock Cockerels