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. 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. 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.
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.
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. 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. 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. 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.
It can be genetic, and therefore hereditary, and is more common in the hybrids and heavier breeds. Double-yolked eggs generally won't hatch if incubated, and if they do, both chicks usually don't survive, although it's possible. Hens who lay large or double-yolked eggs are more prone to becoming egg bound or suffering vent prolapse, both potentially fatal afflictions. Her regular eggs are huge, weighing about 2. But there's not much I can do but keep a very close eye on her for any signs of distress and be sure she doesn't get overweight, which can also lead to egg binding.
As you can see from the standard egg size chart above, even Annie's normal 2. She's our best layer and I save her eggs to make fried egg sandwiches for breakfast usually on Sundays. Our smaller eggs I use for scrambling. Articles may contain affiliate links.
Log in or link your magazine subscription. Account Profile. Sign Out. Triple yolks also happen occasionally. So when Corrine Finch cracked open not one, but two double-yolks while making breakfast on Tuesday, she was naturally surprised. But she was even more shocked to find double-yolks three and four on Wednesday, sharing her find in a post uploaded to Instagram.
And things didn't end there; on Thursday the Australian woman cracked double-yolks five and six - each one from the same box. Although it is rare to find so many in one carton, Ms Finch is not the first person to do so and she probably won't be the last.
The chances of getting a double-yolk from one of these hens is much higher.
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