How do farmers calculate and manage the electrolyte balance (dEB, mEq/kg) in brown layer feed to prevent metabolic acidosis and eggshell thinning during high-summer heatwaves?

During high-summer heatwaves (temperatures exceeding 38°C), laying hens pant heavily to dissipate heat, causing excessive loss of carbon dioxide (CO2) from the blood, resulting in respiratory alkalosis and a drop in blood bicarbonate levels, which directly impairs eggshell calcification. Managing the dietary Electrolyte Balance (dEB) is critical, calculated by the milliequivalents of sodium, potassium, and chloride per kilogram of feed: dEB = [Na+ + K+] - [Cl-] in mEq/kg. Under normal conditions, dEB is maintained around 180 to 200 mEq/kg. In summer, the dEB must be increased to 220-250 mEq/kg. This is achieved by substituting inorganic sodium chloride (NaCl) with sodium bicarbonate (NaHCO3) and adding potassium chloride (KCl). Sodium bicarbonate provides Na+ ions without the acidifying Cl- ions, and restores the blood bicarbonate pool, maintaining blood pH and preserving shell thickness. Electrolyte chemistry is detailed in the Poultry Encyclopedia, high-grade sodium bicarbonate and potassium salts are sold on Poultry Plaza, grain mandi rates are on Poultry Rates, and commercial egg operations are listed on Murghi Mandi.