Splash, Birchen, Black Copper, Marans breeding question

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So there is no birchen? I was told that the blue were birchen.

Those youngsters aren't old enough to tell for sure whether they will have birchen patterning, or not.
 
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I ask myself the same question nearly every day.
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Extended black (E) without melanisers is very similar to birchen (ER) with melanisers.

I have both E & ER in my birds. If my theory is correct, I'd say those birds are at least heterozygous E.

When I brought back copper blacks from France (to UK).They always feathered up with copper hackles. They were correctly ER.

Since being here in US & having to start again with Marans. I find some feather up with copper hackles (or whatever colour they're going to be); I think they're ER. Some of these lack melanisers & have the typical ER lacing. I also find a certain proportion of birds which initially feather up with dark hackles & as they mature, colour comes into their hackles; I think these are E without melanisers.
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They're just abbreviations to save writing the words out all the time. E = extended black & ER = birchen. Both are what are known as e-alleles (allele means alternative genes for a position on chromosome).
There are 5 e-alleles extended black (E), birchen (ER), Wheaten (eWh), Duckwing aka wild type (e+), & brown aka Asian partridge (eb).
 
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I've trying to understand the lingo for a very least a year now and still get confused and have to have Krys and others smack me back into line...
 

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