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you asked one of the more difficult questions lol I am a little confused on this subject myself. As far as I understand.. there is a fair amount of overlap between E and ER chick down. Some believe the white dot by beak is a sign of E and a lot of E do look like Michonne. Notice, the dot is almost not present on one side.. shows how variable it can be.
Other questions.. what does an E/ER chick look like? Adult plumagewise, E is dominant over ER but best not to rush thinking the same would apply to chick down. There have been several surprises where a line assumed to be pure E or ER only to sequence out to be either the other or a mixture of both.
one sign I consider to be reliable is the brown or white brushed face on black chick is ER. could not find a better pic with quick googling so am cheating by showing a sebright(100% guaranteed pure ER) chick.. ignore the feathering, look at the mask if you see it, classic ER mask. Of course most ER don;t have it, don't ask me why:
http://www.feathersite.com/Poultry/CGP/Sebr/GSebrightChix.JPEG
As for your cross chicks, I suspect most Marans are E or E/ER mixes. Because I had black coppers, they consistently kept throwing chicks and adults that looked like examples of what E are supposed to look like without modifiers. "not enough copper"- hens with either no copper or just a minimum on the lower back hackle, roosters having it only on neck and back, no 'lacing' or the color spreading anywhere else. That;s how E usually looks with no modifiers. I suspect that might be why some breeders are struggling with trying to get more color- they need ER but their birds might be simply all or mostly E. I can't prove it though, because there is also a plausible possibility of modifiers making them(if ER) dark.
No idea if solid colored Amers are more likely E or ER, sorry.
Yep, confusing.. with this one issue it really is best to assume as a general statement it is true- but do not be surprised if proven otherwise..
Oh goody! A challenge!!!!!
I'm pretty sure now that one of the "Puppy" eggs in the incubator is actually Switch's egg. Will be super interested to see what happens!!!!
Thanks as always for the discussion of it - I always learn a little bit more each time (and you are very patient!!!)
- Ant Farm