I was surprised to see so many egg yolks, lined up in her oviduct and clustered around her ovary.
Chickens (all birds) have two ovaries when the are born, but only the left one (right one in some raptors -- don't ask why because I don't know) develops and produces eggs.
This is a lot of good-sized (i.e. fairly developed) yolks, but apparently not outside normal limits. I asked around.
* The ornery Daughter of Henery who drew blood while I was gathering eggs last week