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My mother once bought me a box of 15 eggs from a little shop on the side of a farm.
All 15 eggs were double yolk.
I dont know the odds of that happening and how it happens.
I told my mother. She didnt sound surprised at all.
It's a genetic trait, so if they kept breeding a twin-maker hen for efficiency alone (if you raise chicks, you get 2 for 1 effectively), that could mean that most of their stock are now laying dual yolks.
Are there nutritional differences in said dual yolk eggs or is one truly getting double yolk nutrition?
The two yolks together are like 30-50% larger than one regular one, so the nutrition facts are slightly changed since the amount of egg white is reduced.
Since most calories actually come from the yolk, I'd say it should be noticeable to some degree, if you really measure it.
(This answer was brought to you by my wife, who happens to be a nutritionist).