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Yep they would be sexlinked and if your Cuckoos are dark egg laying stock ( as some hatchery Marans eggs are no darker than some regular breeds) then you should get some dark eggs out of them too.
Yep they would be sexlinked and if your Cuckoos are dark egg laying stock ( as some hatchery Marans eggs are no darker than some regular breeds) then you should get some dark eggs out of them too.