Easter egger

We have already gotten four eggs from her! They are still small but she is a very small chicken. Photos for size comparison - She is a lot smaller than my gold laced Wyandotte who isn't fully mature yet.
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I'm starting to wonder if she is a bantam australorp x araucana! From left to to right: Her first egg, her fourth egg, a store bought egg, a duck egg.
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She was from a good breeder, who we go to often. She was definitely half araucana. They select chosen birds to produce specific crosses. She has many traits similar the pure araucana we have, as well. Sometimes with crosses, a very small percentage of birds won't produce green eggs, we were really unlucky but it does happen. The person who sold her to us wasn't hesitant when they told us she would lay green eggs, so it must have been just to do with her as an individual bird not carrying the blue egg gene. I am 100% sure she is half araucana. :)
 
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The blue egg gene is dominant. If a bird is pure bred, they will carry two copies of the gene. So when you cross a pure bred Araucana with a chicken that carries the recessive white egg shell alleles, you will get 100% blue egg layers (if the other parent lays white eggs) or green eggs (if the other parent carries brown).

So the Araucana was not pure.
 
I understand the blue egg gene is very dominant. I was a bit confused at first when I saw the straight comb and then the cream coloured egg. I will ask the breeders what they think next time I see them. Thanks for your replies.
 
I was agreeing with you about the blue egg gene being dominant, I meant that I was surprised when I noticed she had a straight comb instead of a pea comb, knowing she was half araucana. The people who sold her to us buy some of their breeding stock at a high price from large competitions, and their chickens have been known to win awards. They have 40 years of experience and are very knowledgeable about their birds. I don't have a picture of the parents, but I do have a photo of our purebred lavender araucana. She is too young to lay yet but I know she will lay blue eggs. She is pure. I will ask about the araucana x australorp when I visit the breeder we got her from tomorrow. Maybe it was to do with a very slim chance, even though the blue egg gene is dominant, she is still a cross bred chicken and things just don't always turn out how they're meant to. Photo of our araucana: (The SOP here in Australia is different) -
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I understood. :)

However, both the blue egg shell gene and pea combs are dominant. If the parent was pure, all offspring should carry one copy of that gene, which being dominant would express itself. It's likely there was a mix up in the parentage.
 
Ok, I will have to double check with the people we got got her from. Had no idea it was something to do with the parent, I thought all their birds were pure and pretty well bred. I'm interested to see what it was with the parents / what they think may have happened. :)
 
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