What causes pale, chalky, or white eggs in a healthy brown layer flock under acute heat stress?

The dark brown color of commercial eggs is due to protoporphyrin IX, a pigment synthesized in the shell gland (uterus) and deposited onto the outer shell layer in the last 3 to 4 hours of the calcification process. Under acute heat stress (temperatures above 38°C), hens pant heavily to cool down. Hyperventilation expels excessive $CO_2$, raising blood pH and inducing respiratory alkalosis. This physiological state severely disrupts the enzyme pathways and transport proteins required to synthesize and transfer protoporphyrin IX. Consequently, the eggs laid during hot spells are highly pale, chalky-white, or unevenly colored. Supplementing drinking water with potassium chloride, vitamin C, and aspirin stabilizes blood pH and restores shell pigmentation. Farmers can consult stress management papers in the Poultry Encyclopedia, buy summer stress supplements on Poultry Plaza, monitor daily rates on Poultry Rates, and trade on Murghi Mandi.