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.
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.
If someone wants fertilized chicken eggs for hatching, then it is best to get the eggs from a farm. The chances of getting fertilized egg is higher there because of the presence of a rooster. One would then need to know how to incubate chicken eggs. The chicken will hatch after approximately 21 days. If a egg doesn't hatch within 27 days, it is best to discard it. More on how to hatch chicken eggs.
Many people wonder, if it is okay to eat a fertilized egg. Well, there is nothing wrong in eating a fertilized egg; moreover once its in the refrigerator, there is no growth of the embryo whatsoever. Eggs are highly nutritious foods, though many people wonder, 'are fertilized chicken eggs healthier'? Some people do claim that fertilized eggs are more nutritious but this is a highly debatable topic. Eggs do tend to lose their protein content the longer they are kept. So you can say that the freshest eggs are the most nutritious. More on eggs nutrition facts.
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