Age factor: The secretion of hen's shell membrane does not increase with age. As we age, the egg weight and egg volume also increase. Limited shell membrane secretions will diffuse into the eggshell and the eggshell color will become lighter. Disease factors: Diseases, especially sub-clinical ones, cause reduced secretion, shifting non-essential metabolic activities to essential activities, causing lightening of eggshell color. Adding a small amount of antibiotics or anti-disease additives to the broiler's feed will help improve eggshell color.
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