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Assuming these are all purebreds, your Partridge Brahma roo and your Australorp roo are the only roos that would reliably produce sex-link chicks. Your RIR x EE roos possibly could make sex-links, but since EEs are mutts there's no way to know for sure other than just trying it and seeing what you get. You can cross your Aussie or Brahma roo with your Barred Rock and Cuckoo Maran hens and make black sex-links.
super! thank you for letting me know...i shall give it a try
Assuming these are all purebreds, your Partridge Brahma roo and your Australorp roo are the only roos that would reliably produce sex-link chicks. Your RIR x EE roos possibly could make sex-links, but since EEs are mutts there's no way to know for sure other than just trying it and seeing what you get. You can cross your Aussie or Brahma roo with your Barred Rock and Cuckoo Maran hens and make black sex-links.


