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The reason why we choose native chicken is because the native breed cannot be confined. By nature, they cannot be placed inside cages as they are wild animals.
The chickens and eggs laid tend to be more nutritious because these chickens have exposure to sunlight, which their bodies convert to Vitamin D, and pass it on to their eggs. Eggs from pastured-hens have three to six times more vitamin D than eggs from hens raised in confinement.
Read: WHY YOU SHOULD BE EATING SLOW GROWING, NATIVE CHICKENS