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You're right, most readily available sex links from hatcheries are cross breds, but it is possible to acheive sexlink coloration by breeding different colors within the same breed, and you're also right in that the only real point of this is production/utility uses, as they do not breed true.
EDITED TO ADD: Has nobody actually done this? I have seen pictures of the Golden Cuckoo, which, I understand, actually tends more towards autosexing than sex-linked? But, I'd really like to see others.
I know that any black sex link cross will produce black hens with leakage in the hackles, and barred roos, so I am more interested in the appearance of the red sexlinks. Like I mentioned before, do the birds retain things such as lacing? Columbian coloration, etc?
Yeah, dont get those confused, The Sexlinked part would be crossing a BCM roo on Cuckoo hens to make Sexlinks where the roos look like Golden Cuckoos. The Autosexing part is a characteristic that breeds true when breeding a pure homozygous barred Golden Cuckoo Marans roo to Gold Cuckoo Marans hens which makes some differences in the chicks. But remember the Autosexing trait breeds true in the same color. Most pure barred breeds can be autosexed though it may take some eye training. Legbars and breeds like that work on the same Autosexing principal as the GC Marans and other varieties were a pure homozygous barred roo can be bred on barred hens.
And yes the lacing and columbian coloration or what ever color pattern is used is retained if both partents had the same pattern. like GL roo on SL hen or Partridge Roo on Silver Penciled hen or Buff Columbian roo on Light/ Silver Columbian hens, ect.....