If chicken were bred for maximum yolk size, how big could the yolk-white ratio be at most?

I would guess as long as there was enough white to keep the embryo hydrated the ratio could get really high. Although at some point too much yolk would be wasted as the chick could only grow so large in the egg. I’m curious where this question came from?

@Adirondackwannabe
Because the yolk is the most delicious part of the egg for me, so the more of it in the egg, the more I would enjoy them.

Good point. I was thinking how great an omelet an egg with a really large yolk would make when I first saw your question.

I wonder if the double yolk eggs have more yolk to white ratio? Or, if each yolk is small and it winds up the same.

Possibly it isn’t necessary the yolk could be viable to exist. We create animals that are infertile because we cross breed them, so in nature if you play with things you can get a result that doesn’t necessarily help the species.

Funny, I remove the yolks and eat just whites, except for when I really treat myself.

There are many breeds of chickens and egg size and prolific laying is based on breed for the most part. Bantam breeds produce smaller eggs, obviously, and the larger, heavy weight breeds produce larger eggs.
However…all eggs are mostly water and if a hen is not getting enough water the content of her eggs will suffer accordingly.

Just like fruit trees, the size of the fruit and it’s viability will have everything to do with how much water the tree/plant is taking in when in production mode.
Same for chickens.
The size of the yolk ( embroyo ) will be based on the size of the breed, with larger breeds producing larger yolks. Just like any other species, the size of their offspring is determined by their breed.