I know turkey eggs normally have two yolks each, but only one poult hatches. What is the purpose of the second yolk in the shell?

Double yolk eggs occur when ovulation occurs too rapidly, or when one yolk becomes joined with another yolk. These eggs may be the result of a young hen's productive cycle not yet being synchronized.

https://en.wikipedia.org/wiki/Egg_yolk#Double_Egg_yolk

Double Yolkers appear when ovulation occurs too rapidly, or when one yolk somehow gets "lost" and is joined by the next yolk. Double yolkers may be by a pullet whose productive cycle is not yet well synchronized. They're occasionally laid by a heavy-breed hen, often as an inherited trait.

http://b-inet.com/sammy/double-yolk-eggs/


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