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The loss of electrolyte balance in diets ofbroiler chickens has resulted in a serious distur-bance of blood acid-basebalance, coupled with elevated body temperature. The body losses carbon dioxide(CO2) and bicarbonate (HCO3), resulting in respiratory alkalosis or acidosis.Under tropical conditions of high environmental temperatures, the balance ofelectrolytes in feeds must be set much higher as to maintain equal metabolicand digestive efficiency. However, information on the ideal dietary electrolytebalance (DEB) that could effectively correct acid-base imbalance in broilerchickens under severe heat stress condition is scanty. Therefore, the effectsof varying electrolyte balance in diets on haematology, blood glucose and seruminorganic elements were assessed in broiler chickens at starter (0 - 21 d) andfinisher (22 - 35 d) phases, under temperature-humidity index of 24.97 - 35.19.One day-old Arbor Acre chicks (n = 300) were procured and randomly allotted todiets supplemented with potassium chloride and sodium bicarbonate, to balancemonovalent ions (sodium, potassium and chloride) at 210 (T1), 240 (T2), 270(T3), 300 (T4), 330 (T5) and 360 (T6) mEq/kg DEB, in a completely randomiseddesign. On days 21 and 35, blood (5 mL) samples were collected from birds ineach replicate whose weights were closest to the mean class weight forhaematology and serum biochemical indices using standard procedures. Data wereanalysed using descriptive statistics and ANOVA at α = 0.05. Different levelsof DEB did not significantly affect (P u003e 0.05) haematology and blood glucoseat starter phase. However, at finisher phase, heterophil: lymphocyte of birdson 270 and 240 mEq/kg DEB were lower (P u003c 0.05) compared to other dietary treatments.Blood acid-base balance was relatively enhanced in birds on aggregate DEB levelof 360 mEq/kg with reduced chloride ion and relatively lower incidence ofhemodilution with respect to high haemoglobin levels as this level isadvantageous in balancing blood acid to base ratio in broiler chickens rearedunder severe environmental temperatures higher than 43?C ± 5?C as against someprevious opinions that did not take into consideration, the inherent dietaryelectrolyte balance in feedstuff, other functional mono or divalent ions, andthe severity of environmental factors.

The Roles of Key Electrolytes in Balancing Blood Acid-Base and Nutrient in Broiler Chickens Reared under Tropical Conditions