Where do *most of the brown grocery eggs come from?

[MROO]

Hello I’m making a school project on chickens, and I’m doing a section on egg laying.

Do you know what breed is most widely used for the brown eggs? I’m seeing different info.

Contact a few hatcheries and ask. Many are very open to school-based research projects.

 

[SourRoses]

Surface texture, thickness, shape, size, permeability, lack of extra calcium deposits,

Truly interesting!
Would it be possible you might have links or do you recall the specific wording about each shell aspect?
For instance, how do they describe the perfect shape? How did they decide what was best?

Personally, I have a hen who adds deposits, some amusing like a squiggly drop of paint. But would the larger populace find something unappetizing about that or did it come about for the sake of not catching on equipment or some such thing?
I've another hen who lays the glossiest eggs I've ever seen, which I desperately want to breed into my line of mostly chalky texture layers. But store eggs are neither glossy or chalky. How did they arrive at that ideal?

Maybe we could have a new thread so as not to derail this one further?