I live in Arlington Washington State ( I think every state has an Arlington) and we have a huge egg farm. Millions of eggs. I tried to work there once upon a time, and it was horrible and a fiasco for both me and the owners. Funny stories there also. But I can guarantee none of those eggs would hatch. The chickens were one or two in tiny little cages where the food came by on a conveyor belt and the eggs went out on a different conveyor belt. I worked quite a few positions there during my 3 day employment but the managers were unable to find a job i could do. Most of it was comical, at least to me. I even did a stint on a conveyor belt where the eggs kept coming and coming and I couldn't keep up. Imagine Lucy and Ethyl only it's eggs. I had dozens and dozens of eggs all over the floor around me. And I couldn't quit laughing. Any way, the head manager didn't laugh. He told me he was going to have to send me out to the chicken house. The job in the chicken house is to walk up and down these long long aisles and when a chicken would have a seizure or blow out, well, we all love chickens so I will just say they are supposed to put them out of their misery. I told him I couldn't do that, I love chickens too much. He threatened to have to let me go. And I allowed as how that was a very good idea. Oh so happy to leave that place.
I guess the moral here is I am so surprised any store bought egg would hatch.
The chickens there were White Leghorns and they were bred for making big eggs. The eggs start small but progressively get bigger and bigger until the chicken can't pass them and they have a blow out. Not a nice thing to do at all. I wonder if our Leghorns that we get will do that also. I have had a leghorn seem like that is what happened. But I don't know.
I do know the only roosters those girls ever met were in the brooder.
I try not to buy those eggs ever. I do not want to support and industry that treats little creatures that abominably. Especially our beloved chickens.