if you have never noticed the numbers stamped on the eggs’ shell, it is probable that you have been eating type 3 or type 2 eggs your entire life.  Luckily, consumers can use a very simple and effective method to know the origin and quality of the eggs since 2004: all eggs have a stamped code that offers some basic data, but the most important one is the first number, which indicates the type of chicken and the raising and care methods used. 

Following you can read the characteristics of each raising method:

Chickens raised in caged without being able to move 24 hours a day. The laying hens live in premises without windows in cages of up to 8 layers. These are the most commonly found eggs; these animals usually do not live for more than 18 months.

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