I expect the decline in occurrence has to do with the way chickens are farmed. Double yolks occur when a hens ovulate too quickly and their reproductive cycle not being synchronised properly. It usually only happens in young hens, but I expect whatever farming methods are used make this likely.
I've only ever had double yolkers in free range (backyard chickens) eggs. These days we buy them from a supermarket and they are supposedly free range but the term is a bit meaningless now (they are still caged, just not individually).
I've only had one double yolker recently, and that was from an organic free range batch of eggs. Yes, I can remember seeing more of them when I was a kid too. Was just talking to a friend the other day who says she specifically buys double yolkers from her butcher - the ones she gets are organic, free range and a lot bigger than normal. Not my cup of tea considering the fat is supposed to be in the yolk and the protein in the white, but she loves them!
Eleven out of twelve is pretty amazing! I haven't seen a double yolker in maybe fifteen years, and that was in a free range (ie. from backyard chickens) egg. I wonder if battery farms select them out when they are sorting for colour, size etc. I remember when we had a tour of an egg farm for school that they looking inside the eggs (with xrays or something, this was maybe 25 years ago so I don't remember too well) to check they were normal so maybe they can detect double yolks and think people won't want them.
We get double yokers all the time. They are special and magical and we keep them for sunday breakfast.
They are produced buy young chickens (pullets) practising laying eggs and are just two eggs in one shell.
We sometimes get double yokers from the quails as well. TOO CUTE
The box of double yokers would have come from a farmer who has a new stock of new chickens (pullets)
Haven't seen one for donkey's or even rooster's years. Hoping that will change when my daughter's brood start laying. The strangest eggs I have seen were when I was turtling on Fraser Island. Often there were triple yolkers. The dingoes would have enjoyed them.
It is rare to find a double-yoked egg this days, I feel that the egg producers must remove them before the eggs are boxed.
I wish they would offer the opportunity to purchase boxes of double yoked eggs, as there was a time when you could buy double yoked eggs.
I suggest that the egg producers offer them to be purchased as I believe many would buy them (they look great on the plate for breakfast).
I'm ith most on this one. When mum did a lot of cake cooking when I was a child we often had them. She used to crack each egg into a separate bowl before adding to her mixture. Sadly it's probably been around 55+ years since I've seen one
I used to get some, but only 2 doubles in the 1 box, very occasionally when I bought the eggs from the veggie shop, which was next door to the supermarket, but that was many years ago now, & I now shop elsewhere.