What breed lays double yolk eggs

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You only breed for a high consistency of the double yolkers. You would still want those few single yolkers for hatching. People who breed for double-yolkers know better than to try and hatch the double yolks. Instead they select those few that have laid "some" single yolks and hatch those. They would still have the genetics to lay doubles yolkers themselves, just with the "occasional" single yolked.

-Kim
 
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Well, most of the time when my sexlinks lay their rare double-yolkers(I have only gotten a couple in the few years I have had the hens) the double yolk eggs are usually double the size. The first time I found a double yolker, I did not realize it until I was in the house and picked it up and wondered why I couldn't fit my whole hand around it, like I usually could. I compared them side by side with a regular egg and it was almost twice the size.

Candling could also be done to see whether it had one or two yolks.

-Kim
 
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Speckledhen did, but the chicks didn't survive. I've never heard of anyone having a successful hatch with a double yolker...
 
IT is considered uncommon for doube yolk eggs to hatch, but as with all things in the animal world, that isnt set in stone.
Much of that comes, I think, from the admonition to not try to incubate doublers. Since for a VERY long time, it was more about doing what worked and not experimenting, the admonition sort of stuck as immutable law. Afte all, when your life depends on your livestock, its best to do what you can rely on.

As we are learning here everyday on BYC, many things can be done that the go against the rules.
SO, in a real sense we're all groundbreaking pioneers!!
 

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