Double yolk eggs are not all that uncommon. When a hen ovulates, sometimes two or more ovum are released at the same time. All are encased within a single shell as they proceed down the oviduct.
The purpose of the yolk in a chicken egg is to feed the chick. It is a store house of nutrients and is rich in protein and fat.That is why the yolk is said to be the unhealthy part of the egg in terms of high cholesterol content for calorie and fat conscious people.
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The white or albumen of the egg contains slightly less protein than the yolk. That is because of volume. Most of the actual nutrition is in the yolk and eating the two combined as whole egg is far better for you nutritionally.
The yolk and the egg white serve as sources of food in an egg. The yolk contains nutrients like proteins, fats, and vitamins, while the egg white consists mainly of water and proteins.
A fertilized egg's yolk provides all of that embryo's nutrient, it also provides protection to the embryo. There are two types of yolk, white yolk and yellow yolk, both having their purpose.
One Chicken egg has cholesterol of 201mg and 1.6gms saturated fat (55 gm egg) ... restricts their chicken egg intake to one or two eggs per week and most likely should avoid ... In summary, an eggs cholesterol is found in the egg yolk
Double yolk eggs can be laid by any chicken breed, but it is more common in young hens that are just beginning to lay eggs. It is not specific to a particular breed.
Many birds can lay a double yolk egg. Chickens,ducks and turkeys all will occasionally lay a double yolk egg. Double yolk eggs will not hatch.
The white dot on the yolk is the blastodisc, or where the chick embryo would form if it were fertilized. If you're talking about the strands that look like tails on the yolk, those are the chalazae that keep the yolk in place in side the egg.
Two yolks inside one shell. Sometimes when the hen releases the oocyte from her ovipositor two are released at one time. Not as rare as most people believe but because of todays technology, the egg producers are able to separate the double yolk eggs and sell them at a higher price. Buying eggs from a local farm will often result in your finding a double yolk egg in a dozen fresh eggs at breakfast.
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There is albumen, where the embryo gets protein and the yolk, where the embryo gets fat.