Are auracnas, ameracanas & EEs the only pure bred blue egg layers? (I know EEs can lay an assortment if colors. ) I'm not looking for a very detailed answer
Thanks!

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Ok wow! I've never even seen this breed before! Thanks!
There are several pure breeds for blue eggs: auracnas, ameracanas, Cream Legbars, and Arkansas Blues. Easter Eggers are not a breed. They are a hybrid and you are not guaranteed to get a blue egg.
For sure laying capability of blue eggs, the Arkansas Blue wins hands down. I have some that just started laying at 14 weeks. Plus because they are based upon a research grade Leghorn, they are small in size and eat very little. And they lay a large egg. The problem is finding a breeder with eggs or chicks willing to sell. I went through several egg shipments before I got a flock of them going.
But I also like my Cream Legbars. But they don't start laying for 24 weeks or later.
Well that's true for every chicken breed. Some are just standardized and approved by the APA. However, just because the APA doesn't recognize them doesn't negate the fact that they do in fact breed true. I have 15 rare breeds. Not a single one, including the English Orpingtons are recognized by the APA. Yet some of my breeds like Ayam Cemani and Svart Hona breed true and sell for thousands of dollars. So "breed" is a strange word with chickens. It's more about appearance and standard features than true "breeds" in other animals.X 2 - except that even the Arkansas Blue being a "breed" would be an interesting discussion - here is an interesting discussion https://www.backyardchickens.com/t/624359/blue-egg-layers-from-university-of-arkansas