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Since nobody answered your Araucana question , I'll volunteer what little I know . The lethal gene is linked to tufted birds ; its only been a problem in the pure , bilateral tufted Araucanas as far as I know . Ameraucanas are not tufted so shouldn't carry the lethal gene associated with them . Since they are often surviving right up to hatch day , my opinion [ for what little its worth ] is that they are just bred too tight and the F1 crosses should end the lack of necessary vigor needed for a successful hatch .
Thats what I figured really, but it seems odd that they develop fully and then don't hatch. Is that the same in the case of the lethal gene.
It seems if they were too inbred, they would quit somewhere else along the way. I'm new to chicken genetics, so I'm just speculating. I think outcrossing is the way to go regardless. Now I don't have to, thanks to Julie and Kathy!
Of course, I am still going to work on my Wheaten project, which will take at least 2 more generations.