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I got chills this morning making breakfast as I cracked open 6 eggs in a row, all having 2 yolks each.

12 yolks, 6 eggs

I've read this is caused by an anomaly that is considered normal in an egg here and there.

I guess the question is, is a whole crate of double-yolk eggs a "bad" thing or a "good" thing? I'm inclined to go with "good" because it seems there's a heck of a lot more protein and nutrients in a double-yoked egg. And yes, that omelette did end up tasting like a 12-egg omelette with half the whites discarded.

Yet, having no good evidence whatsoever I'm suspicious these hens were dosed with some fertility drug.

Thoughts?

Note: Yes all 12 eggs ended up having 2 yolks each.

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    Well normally I'd say "good luck". But the odds of all the eggs having two yolks? I'd say someone at the farm is playing a prank on you.
    – Sobachatina
    Mar 22, 2017 at 15:17
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    That has happened to me too. I liked it! The eggs were my normal brand but of a larger size than I normally buy. Just for fun: One of the most common superstitions is that double yolks mean a baby on the way. All 12 of my dozen eggs from the mega-mart had double yolks.
    – Jolenealaska ♦
    Mar 22, 2017 at 15:17
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    Jackpot! I would love a carton of those!
    – Cindy
    Mar 22, 2017 at 17:04
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    I grew up on a chicken farm so I know. At peak laying phase some chickens in every flock will lay double-yolkers. The experienced egg-picker will notice them at once, because they are bigger and have a different heft. We used to put them in a different tray and sell them separately to people who were prepared to pay more for these special eggs. If your egg producer sells extra-large eggs, there will be more double-yolkers in there.
    – RedSonja
    Mar 23, 2017 at 9:24
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    In the Netherlands they package these as 'double-yolk' eggs (dubbeldooier) and charge more for them. At least they did 10 years ago when I lived there.
    – pickarooney
    Mar 23, 2017 at 14:44

4 Answers 4

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Double yolking tends to happen more often in spring and with young or very old birds. As commercial egg producers do not tend to let their birds get old, unless you are getting farm eggs, they are likely young birds.

Automatic candles may be set up to separate these as suspect so they had to be re-run to verify they were not bad, which will result in them being grouped.

When I raised birds, it seemed like brown egg varieties have this occur more often than white eggs, but that is just my experience. Some people actually try to breed for this and it is more common in some birds. It also makes young birds a bit more profitable as the eggs are large than they would normally be for new layers. There are considerable downsides as well for the birds though. The eggs are not viable, almost always if incubated the egg will fail as if both are fertile, the egg cannot support twins, and one failing in the shell will lead to the demise of the other. Also, the eggs are larger, so a young bird is laying eggs larger than it is physically ready to lay, and for an old bird the eggs can become monstrous. This causes a much higher mortality rate in birds.

I have very seldom had double yolks in commercial eggs, but there seems to be something in the water this year. Just last week I had a dozen also that 10 of the 12 were double. Just my luck, I was trying to make angel food cake and did not want them. lol

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    Are you saying birds are dying from laying too big eggs? That sounds like a terrible death!
    – njzk2
    Mar 23, 2017 at 15:57
  • This is a clear best-answer. Still, I do find myself wondering about a combination of candling and practical joking!
    – Charney Kaye
    Mar 23, 2017 at 16:14
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    You'd think if they grouped them then they would mark the box or something. I mean, "All double yolks!" sounds like a marketing idea waiting to be done.
    – David Starkey
    Mar 23, 2017 at 17:31
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    @njzk2 Yes, we have selectively bred birds for higher production in numbers and size of eggs, and that does make them more susceptible to some things. Larger eggs from smaller birds are more productive, but harder on the bird, so results in higher mortality. Not making moral judgement, just a fact of selective breeding. Intentional breeding for high rates of double eggs is actually difficult and discouraged, but is still sometimes done. High mortality rates tends to make it uneconomical. It is easiest on birds in spring though, which is also when it most often occurs.
    – dlb
    Mar 24, 2017 at 12:52
  • PS. I raised a lot of waterfowl, and if you ever want to see something scary, a double yolk goose egg. The geese i had, their eggs were about 8 oz. each to begin with. The occasional double yolker would be more like 12 oz, or about the weight of 6 large chicken eggs.
    – dlb
    Mar 24, 2017 at 12:57
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Eggs are 'candled', visually inspected against a light source to check viability. It seems to be standard practice for double yolked eggs to be grouped together, though I can't find a source as to why that might be. I have heard of it several times anecdotally though.

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    In a hotel I once worked in, we would get through thousands of eggs a week. Obviously at that scale these eggs were the cheap commercial ones. Every week or so we'd get a full 30 egg tray of double yolkers. I think this backs up your answer.
    – Doug
    Mar 23, 2017 at 6:58
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If your eggs are from a commercial egg company like those common in the US, there are a couple of related factors that could have contributed to your all-double-yolks carton of eggs.1

First, commercial egg farms tend to raise hens in staggered flocks, with special growing conditions applied to have all the hens in a single flock reach peak productivity and "retirement" age at approximately the same time. This has some advantages of efficiency, but it also means that hens in a given flock will tend to be in double-yolk phases of their lifecycles at the same time.2 If the eggs of a single flock are processed together, it increases the odds that individual cartons of eggs will have multiple multi-yolk eggs during these phases.

This is not necessarily a drawback from the point of view of the egg packager. One side effect of double yolks is that the eggs are larger than normal.3 Luckily, there is a market for larger-than-normal eggs. This brings us to the second possible factor: you will tend to find more double-yolk eggs in cartons of extra-large and jumbo-size eggs. Anecdotally, I've found double-yolk eggs in almost every carton of jumbo eggs I've ever bought, and have had cartons with as many as eight-out-of-twelve eggs doubled. Your twelve-out-of-twelve is still impressive, though—and if they were regular-sized eggs, doubly so.

1 Some brands also actually specifically package and market cartons of double yolkers, but I assume you would have noticed that!
2 As mentioned in other answers and comments, hens who are not in the prime of their reproductive lifespan are more prone to ovulation "misfires" such as double-yolk eggs.
3 However, the individual yolks are usually smaller than the yolk from a regular egg. (Similarly, a human woman's abdomen gets bigger with a twin pregnancy than with a singleton pregnancy, even though twins tend to be a bit smaller at birth than the average singleton.)

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    Jumbo egg cartons will often mention the possibility of double yolks in the small print. If you need egg whites and it's spring, don't buy jumbo eggs. (It's very hard to separate double-yolk eggs; the yolks love to break.)
    – Marti
    Mar 23, 2017 at 20:05
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I love double yolker and I find it is indeed more common at certain times of year. I have one brand that I use and it consistently has double yolks almost year round. Sometimes though I will go a couple months without a single, double, yolker, bummer. I generally end up with an entire carton of doubles when I find one in the batch. I know that there used to be a brand at one store that offered cartons of only double yolks. For some reason, they no longer carry them.

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