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The only ways I know what eggs comes from what hens are:
1) by egg color and that is not an exact science
2) seeing a hen in a box and finding one egg....sometimes 8-10 eggs are in a box
Two hens I know for sure, 1) my easter egger that lays mint green eggs and 2) I have a RIR mix that lays a super dark cherry egg
My Java's and my Barred Rocks lay lighter eggs, my SLW lay a slightly darker egg and my sex-links lay a brown egg.
At times there are 18 eggs in he nest boxes and I would say about 10 different shades of brown and one green.
When I is a bit warmer, I will put all my Java's in one pen and hatch all Java eggs
Somewhere on this site, Robert Blosl posted a piece on trap nests and how the old breeders used it to get the exact hen trapped in the nest box with her lai egg so he could record the color/egg weight/and from which hen/hens band number.
Maybe we can find it.
But I assume each nest box, has to be spring loaded so a door closes when the hen enters, and that would be alot of work.
It would be easier, to seperate just that one hen for a day or two even, to see just her eggs alone.
Or breeding coop with the Cock that carries these genetics, to get pure eggs from just those 2 birds.
Honestly she looks like she was crossed with a ring neck pheasant.