With yellow-skinned hens, such as white leghorns or cross-breeds with the white leghorn, loss of yellow pigment from their skin is an important characteristic for determining good egg production. As a pullet grows, yellow pigment from the feed consumed is deposited in the skin, beak, shanks, and feet. Once the pullet starts
laying eggs, the yellow pigment is removed from these locations on the body and is put in the yolk of the egg, which explains why the yolk is yellow in color. Therefore, loss of yellow skin pigmentation in a laying hen indicates that the laying hen has good egg production. Yellow pigmentation is lost from the hen's anatomical body parts in the following order: vent, eye ring, earlobe, beak-base, beak-tip, bottom of foot, shank and hock/top of toe.
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