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1. Density and hardness of the shell
Healthy hens produce eggs with a very hard shell and healthy eggs are a little hard to break. If you have noticed that the shell of your eggs breaks easily, it means that the quality of the egg is not good.
2. The color of the yolk
Light or bright yellow is not the perfect yolk color, although it’s probably the yolk color people usually see. A healthy egg has a deep orange yolk.
3. The thickness of the yolk
Egg’s quality can be also determined by the thickness of the yolk. Healthy egg yolks are rounder and thicker.
Researchers report that healthy nutrition is key to producing healthy eggs. For example, the amount of beta-carotene can be increased if the chicken is fed with more beta-carotene.