Thanks, I'm pretty sure it was one of the EEs then so far, I will just have to wait though for confirmation when all the girls start laying.To lay a green egg requires both a blue egg laying gene and a brown egg gene.
These genes are independent of each other, meaning the blue egg gene has nothing to do with the brown egg laying gene.
Brown is not actually a shell color, it is an overlay. Blue is an egg shell color, and white is actually the absence of blue...if that makes since?
SO I'm not saying your EE's laid that egg...but something you have is carrying both the blue and brown egg genes, which is what most refer to as an EE.
If you have another"breed"....say An Orp for example, and she lays a green egg that means somewhere in her background is a blue egg layer.
If the bird that lays the green egg was hatched from a brown egg, then her father carried the blue egg gene.