Double yolkers

These are more common than most people realise. They occur when, for whatever reason, a second egg/yolk is released from the follicle before the previous one has been encased in shell. The record for the largest number of yolks in one shell is 9 (source). In rare cases, the first egg – shell and all – is encased by the shell of the second. It is most likely to occur when a pullet is first beginning to lay, or when a hen is either beginning a new laying season, or tailing off (preparatory to moulting). The tendency to lay double-yolked eggs is inherited, and has (largely) been bred out of the modern hybrid layers.

Our Double Yolkers (as of 18th August 2009)

Hen Date Weight Number/Season
Ella 2/7/07 94 g 1/1 (pullet)
Venus 6/7/07 96 g 12/1 (pullet)
Venus 16/10/07 104 g 81/1 (pullet)
Cindy 18/2/08 50 g 3/1 (pullet)
Delilah 6/3/08 82 g 184/1 (pullet)
Princess 6/3/09 41 g 1/1 (pullet)
Princess 8/3/09 44 g 2/1 (pullet)
Sylvie 11/3/09 46 g 2/1 (pullet)
Princess 26/3/09 54 g 14/1 (pullet)

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