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E/E or ER or ewh or eb .....

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Mike Gilbert:
My best brown red chicks hatch out solid black, with maybe just a little grey in front.    I think, at least in my line, those that hatch out with white or yellow chests are split at the e-locus for E and E>R.     The best blacks seem to hatch out with quite a bit of yellow chick down.   I have heard Wyandotte breeders say those turn out to be the best colored blacks.

Mike

Guest:
Thanks for good information!
Curtis, I should have written out Dunn instead of Id as this is what I am curious about and one of the colors common to American/Pit game and a color I may have in my blues.
Mike, do you mean the best blacks have some yellow down or yellow and white? I remember a reference to \"peguin\" being possibly an indicator of ... something. The endless quest!

Guest:
Mottling on extended black produces a penguin chick.


Testing a bird for extended black.

Cross a black bird with a  bird that is columbian restricted. If the  offspring, as adults,  have black plumage on their body the black bird is carrying extended black. If the black bird is  black because of black intensifiers and another e locus then the bodies of the offspring will be columbian restricted.

Rooster

Guest:
I think most Ameraucana blacks, at least my new guys from Paul Smith, are from black/blue breeding, so will have Co as it improves lacing. Would there be any difference in hetero or homozygous Co on E/? or ER/? ?

Guest:
Rose,

The columbian gene  has no effect upon the extended black gene. An extended black bird can have a black body and the Co or columbian gene will not clear the body of the black.
Heterozygous or homozygous Co have no effect upon the extended black.

The columbian gene does effect the expression of black in the bodies of ER or birchen chickens. The columbian gene will clear the black from an ER chicken. Heterozygous and homozygous Co are both relatively effective on ER. Heterozygous Co on females may be expressed as more black stipling on the back than on a homozygous Co bird.

Rooster

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