Can a double yoker hatch?

Animalian

Songster
8 Years
Jun 18, 2011
1,003
15
131
Australia
Just wondering because I doubt there would be space for two chicks in the slightly bigger than normal egg. Would the chicks grow then die in the egg when space runs out? Or only one chick grows would the other yolk go festy? Or would it be infertile no matter what?
Just makes me think cos some people have hens who lay lots of double yokers. Could it ever be possible to breed hens that produce a majority of double yokers? I wouldn't want to, an oversized egg every day = ouch! but yes...
 

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