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I am not 100% sure what the question is. As said above if you use a Blue Copper Marans Cockerel (solid dark color based male) over Cream Legbars hens (barred females) we will get sex links. That means that all the ones with spots on the head (not matter how large or small) will be males and all the ones with out spots are females. As for the size of the spot there will always be some variation. If you were to line breed birds with a concentrated spots or line breed birds with large spots you would be able to increase the frequency of what you has selected for because like beget like, but even then you would see some variation. The cross to the Marans may be part of the variation too. Cuckoo varieties have the dark color base and chicks come out black with a head spot. They are NOT autosexing through because they can only be sexed with 80% accuracy and 100% accuracy is required to be an autosexing breed. The reason the Cuckoo can't be 100% auto sexing is becuse of this varriation in the size of the head spots and there are no other clues as to which is what. With the chipmunk pattern you aren't just looking for the head spot, you are also looking at the eye liner, the dorsal strips, the down color, etc.
thank you.Both boys.. IMHO No head V, no chipmunk stripes.
I had two accidental golden brakel hen crossed with a creamlegbar roo. Both had white dots.. one ended up a roo and the other a hen. She almost ended up with the rooster culls but she had a different voice..so I kept her. Little egg laying machine.
Blue eggs..brakels are large campine that are not hen feathered. They lay med white eggs