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Two days in a row I've broken open two eggs for omelets and discovered double yolks in all of them. That's four eggs out of a dozen (so far)...they're from the same batch I bought at the Union Square Greenmarket last week. I don't recall the dealer. The eggs are slightly more elongated than those I usually buy (not that I ever study them)...
From what I've googled, it's not normal. Here's what it says on Poultryhelp.com
QUESTION: Why does my hen lay double yolkers nearly every day. I think this is not normal.
ANSWER: Nope. It's not normal. Double yolks are a "mistake" in the chicken's reproductive system that sometimes happens when a hen just starts laying eggs and her system is still trying to figure out how to do it correctly. It may also be hereditary. Looks like your hen falls in the latter category.
and
Double yolkers appear when ovulation occurs too rapidly, or when one yolk somehow gets "lost" and is joined by the next yolk. Double yolkers may be by a pullet whose productive cycle is not yet well synchronized. They're occasionally laid by a heavy-breed hen, often as an inherited trait.
and here's this photo of one dozen Trader Joe eggs that all had double yolks.
Wikipedia says that "some hybrid breeds of hens also produce double yolk eggs by default Such eggs are produced in West Bengal, India and in particular by Arambagh Hatcheries in Arambagh."
From what I've googled, it's not normal. Here's what it says on Poultryhelp.com
QUESTION: Why does my hen lay double yolkers nearly every day. I think this is not normal.
ANSWER: Nope. It's not normal. Double yolks are a "mistake" in the chicken's reproductive system that sometimes happens when a hen just starts laying eggs and her system is still trying to figure out how to do it correctly. It may also be hereditary. Looks like your hen falls in the latter category.
and
Double yolkers appear when ovulation occurs too rapidly, or when one yolk somehow gets "lost" and is joined by the next yolk. Double yolkers may be by a pullet whose productive cycle is not yet well synchronized. They're occasionally laid by a heavy-breed hen, often as an inherited trait.
and here's this photo of one dozen Trader Joe eggs that all had double yolks.
Wikipedia says that "some hybrid breeds of hens also produce double yolk eggs by default Such eggs are produced in West Bengal, India and in particular by Arambagh Hatcheries in Arambagh."
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