The continuous high temperature in summer will whiten and lighten the eggshell color.

In summer, it is difficult for chickens to dissipate heat. Because chickens dissipate heat through respiratory system and breathe frequently, the concentration of bicarbonate ions in blood decreases, thus affecting the formation of calcium carbonate in uterine glands and affecting the quality of eggshells to produce white-shell eggs. In autumn and winter, sudden changes in temperature cause chickens to be unable to adapt for a while, affecting calcium and phosphorus metabolism, and also causing eggshells to become lighter and whiter. Strengthening the management of chicken house facilities, making it warm in winter and cool in summer, and creating a good laying environment for chickens are the primary conditions to avoid seasonal white shell eggs.