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Not necessarily, you can use any color roo as long as he is not barred and not dominant white, with barred/cuckoo hens to make black sexlinks, RIRs are just the most popular cross to make them.
Not necessarily, you can use any color roo as long as he is not barred and not dominant white, with barred/cuckoo hens to make black sexlinks, RIRs are just the most popular cross to make them.