Does anyone here know if it is possible for a blue-egg layer to lay a white egg? I ask because yesterday I got a white egg that I think was laid by Maria, who has mostly got her mojo back but not yet resumed matriarch duties, but more relevantly is an Araucana, and who through all her life with me has laid pale blue eggs. I saw her go into and out of the relevant coop, and accept a mating, and shake herself afterwards, so all the signs are there. And yet, ...
She's now at least 8 (acquired as a POL, supposedly, but I was a newby then, so any age bird could have been passed off to me as POL

), and if she laid it, it would be her first egg of this year. So I'm wondering if maybe her oocyan gene stopped working, perhaps as a result of her recent illness (whatever that was), or just old age, or it's just a shell gland glitch? She's the only obvious candidate to have laid it. As I understand it, the blue colour is not just a surface layer applied at the end like brown, the biliverdin is deposited as the shell is formed, so it goes right through the shell (and her eggs are actually blue-er on the inside than on the outside of the shell). But this could still be described as a shell gland glitch I imagine...? Obviously I'll keep an eye out for her next egg, but given her age, that may not be anytime soon