Should both make it to hatching time, the cramped quarters hamper the gymnastics required for them to break into the airspace and eventually escape from the shell.ĭespite all these obstacles, on rare occasions a pair of twins manages to hatch from a double yolk egg. And both, or at least the smaller one, may run out of growth space or oxygen and die in the shell. Or one will be considerably smaller than the other. They may perhaps be connected to one another. Assuming both do begin to develop, with insufficient space for proper growth, one or both will likely be deformed. Hatching a Double Yolkerĭouble yolkers rarely hatch successfully because the shell is not roomy enough to accommodate two embryos. And, of course, you may occasionally find one in your own chicken or duck coop. The reason is that each of the two yolks is smaller than a regular size yolk: “Ultimately, a double yolk egg’s nutrition facts are comparable to a jumbo egg.”ĭouble yolkers sometimes find their way into cartons of eggs sold at farmer’s markets. Now the eggs are being sold at food chains and specialty stores, starting with the posh Brooklyn-based high-end food store Gourmanoff.Īlthough double yolkers command higher prices than single yolk eggs, they do not contain twice the nutritional value, according to the folks at Saunder’s. Saunder’s has long sold cartons of double yolk eggs in Pennsylvania Dutch country, where Saunder’s farm originated. The reason double yolkers don’t commonly appear in supermarket cartons is that they have been removed from the lot through candling.Ī notable exception is Saunders Jumbo Double Yolkers. The presence of two yolks may be verified by candling. In either case, it’s a temporary glitch in the system.ĭouble yolkers are usually easy to recognize, since they’re quite a bit larger than eggs that are typical for the hen (or the flock). Although less common, double yolkers also may be laid by an elderly hen nearing the end of her productive life. During their journey through the reproductive tract, the yolks become encased within a single shell.ĭouble yolkers are typically laid by a young pullet whose reproductive cycle is not yet well synchronized. The hen, or more likely pullet (female chicken less than one year old), ovulates too rapidly, releasing two (or more!) yolks within a short time. So why are we lately hearing so much about those rare double yolk eggs? And what causes double yolk eggs in the first place? Causes of Double YolkersĪ double yolk egg occurs while the egg is developing inside the hen. In the normal course of events, two yolks appear in approximately 0.1% of eggs laid, or about one in every 1,000.
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