Wow... definitely didnt fight my way through that paragraph...
And do you mean the chicken egg or just any egg? Because if you mean any egg, it came first, but a true chicken egg could only be laid by a chicken. The chicken would have to come from the mix of two other animals first, and I don't think we can consider its egg a chicken egg since its parent's weren't chickens.
[I know it wasn't REALLY about the chicken/egg, but I needed to contribute!]