Double or multi yolk eggs whilst very enjoyable are actually a fault. They are common in young, laying hens, especially from hens that are from highly productive strains.
A double yolk egg is formed when two ovulations take place almost at the same time and go down the oviduct together and both get encased in shell.
Double yolks in eggs (also know as double yolkers) are in fact quite rare but if you like the yolk, more than the white in eggs then it’s a rather nice surprise when you open it to find you have two or more yolks!
Poultry genetics says there should only be one yolk per egg. There would be insufficient space for two chicks to develop inside a shell and the breed would effectively die out.
As the hen matures, she will normally only lay single yolk eggs. Double yolk eggs are in fact a fault that occurs when two or more yolks are released inside the ovary at the same time, causing them to be wrapped in albumen (white) and then an outer shell.
It isn’t possible to find breeds of hen that will consistently lay double yolkers unfortunately although some shops will sell double yolk eggs where these have been selected when they are candled for blood spots and other problems at the packing station since a premium price can be charged for these.
Double or triple yolk eggs are usually found in young pullets around 20 to 28 weeks old. The probability of finding a multi-yolk egg is estimated (by the British Egg Information Service) at 1 in 1000 overall but that drops to 1 in 100 for these young pullets. Since commercial farms have flocks of the same age hens, you may just be lucky enough to get several double yolk eggs in the same box… but that’s pretty rare!
Even more rare is an egg with more than 2 yolks. Triple yolkers occur from time to time and in fact, it’s possible to get more yolks in an egg. The most yolks ever found in an egg was 9. Imagine that!
The most unusual egg I’ve seen so far was from Sheryl Harris in Grawn, Michigan.
Sheryl cracked open a giant-sized chicken egg from a young Isa Red hen and to her surprise found a double yolk, plus another small, egg inside (see photo, right).
When she cracked open that egg, it was fully formed; there was another yolk inside.
I can only imagine that the hen was young and laid a smaller egg which somehow got stuck after being shelled in the normal way. The next two yolks would have come down from the ovaries together and the whole lot would have been shelled, creating one large egg.
The multi-yolk shrine
Summer 2015 and I’m updating this page. I’m hoping to start a gallery of multi-yolk eggs! It was suggested we should have a bit of a ‘shrine’ for these eggs since people love them so much!
Please can you send us a photo of your multi-yolk egg ([email protected]) so we can show it here in a gallery! Please include your name and nearest town & country.
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