People often have concerns regarding the eggs they eat but not all the eggs that a hen lays are fertilized. Most of the eggs that are commercially available are unfertilized. Farm fresh eggs tend to have a higher percentage of fertilized chicken eggs. How to tell them apart is a simple trick which you will find out as you read on. The confusion between fertilized and unfertilized chicken eggs will be cleared by the end of this article.
Before we begin, one must know what exactly is a fertilized egg. A hen lays eggs irrespective of the presence of a rooster. The chicken eggs are only fertilized if the rooster has mated with the hen, this has to happen before the egg is formed. Therefore, any egg that a hen lays before she mated is unfertilized but if a hen has mated, then the egg would be fertilized. More on how are chicken eggs fertilized. Even if an egg has been fertilized, once it goes into the fridge, no development takes place of the embryo. It is said that if a hen has mated once, then for an entire week, she will lay fertilized eggs.
How to Tell Them Apart
Traditionally, farmers used to hold the egg up in candle light to spot the embryo and blood spots. These days, special lights are available for this purpose. Using these lights, one can look through the egg to see if it is fertilized. This is known as candling eggs. During the candling of the eggs, a fertilized egg will appear opaque. Once the egg has been cracked open, fertilized chicken eggs look like any other unfertilized egg with the exception that the white circle in the egg yolk will be more pronounced and the yolk will also have tiny red lines running all along its surface. Many people confuse the white stringy material in the egg known as chalazae, as the embryo, but this is present in all eggs to prevent the egg from breaking.
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