How common are eggs with a double yolk?

How common are eggs with a double yolk?
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Answer :

answer:According to the British Egg Information Service, one in every thousand eggs on average is a double-yolker. Double-yolked eggs almost always come from young hens about 20-to-28 weeks old. “In reality it gets its mechanics just slightly wrong. You get a young bird and it comes to lay its first egg and it releases more than one egg yolk. It forms a shell around the egg and out pops a rather large egg with two egg yolks in it.” The chances of getting a double-yolk from one of these hens is much higher. One in every 100 eggs from these birds are double-yolk. Source I’m just impressed that there is a British Egg Information Service.
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