My purebred Ameraucana hen laid a tan egg!!! D=

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Well she is laying..... And I'll take her off your hands if you are still unhappy, lol.
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and I do believe it could be genetics too. Crazy things do happen even to the purest of lines. That's how evolution goes.
 
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Not necessarily true. Ameraucanas can and sometimes do lay green and brown eggs. Buying a purebred Ameraucana is not a guarantee of blue eggs, by any stretch. As with EEs, most Ameraucanas will lay blue or blue-green eggs, but some simpy do not. The genetics involved in blue eggs are complex.

Very true. We found out that two of the three birds we purchased carried a recessive pink gene. The blue egg gene is normally dominant, but they both had a copy of the recessive pink gene, causing one of their offspring to lay pinkish eggs. Well, we aren't gonna breed them together again.
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I've never heard of any pink gene (unless you mean the brown egg gene-I asked a breeder and got that clarification). I can tell you of my experience with BBS Ameraucanas awhile back.

Saw the parent flock of BBS Ameraucanas of some eggs I was getting. Was told, well, if you get one odd-looking chick, a BLRW rooster got in with the BBS Ameraucana hens and that would be where the oddball came from. That was fine-I wasn't breeding them and the Ameraucana eggs were given to me as extras anyway with others I was getting from the breeder, a bonus for me. It was really super nice of her to send them along with the BR eggs she sent. We did get one red chick from one of the blue eggs so we realized that was 1/2 BLRW. Another chick hatched, looked like a black Ameraucana. Later on, realized she was beardless. Thought, okay, it happens-I occasionally got a beardless Ameraucana from good breeder stock I had years ago, so not that crazy.

Later on, as the bird grew, the shape was not quite right for an Ameraucana in body, head or tail. When she began to lay, the egg was brown. As she matured, her shape looked more and more gamey. Remember, the breeder had no gamecocks, only the BLRW, BRs and the BBS Ameraucanas at the time. Upon realizing that her shape and subsequent spur development gave her a decidedly Sumatra appearance, I found that the breeder had gotten a BBS Ameraucana rooster from another breeder who also had blue Sumatras! BINGO! Somewhere back in the lines, there had been an unauthorized breeding so, in spite of the appearance of the parents and the blue egg she came from, she definitely was carrying some other blood in her ancestry. I realize that Sumatras lay white eggs, not brown, but again, something isn't what it seems in the BBS Ameraucana flock that my hen came from, through no fault of the nice person who sent me the eggs. For all she knew, she had a regular BBS Ameraucana flock. Genes can suddenly show themselves generations down the line.
 
I don't know what kind of Ameraucanas you were getting, but mine came from pure lines that have never had any other breeds crossed into it. The breeders I bought mine from breed to win and they don't even raise any other breeds. We called the breeder we bought them from and he had had a problem with a recessive pink gene in his Ameraucanas back in 2005. We just happened to be the 'lucky' ones to get and hen and roo that had it.
 
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