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1. Sodium bicarbonate (NaHCO 3 ), potassium carbonate (K 2 CO 3 ), and ammonium chloride (NH 4 Cl) are commonly used to correct dietary electrolyte balance (DEB) in birds. However, there are many gaps in the knowledge of their effects when used simultaneously. This study investigated the effect of DEB levels on performance, femur bone characteristics and the expression of genes related to the balance of ionic concentrations in broilers at 21 days of age. 2. Male Cobb broiler chickens (n = 245), aged 1–21 d, were divided into groups based on a completely randomised design with five DEB levels (110 mEq/kg, 175 mEq/kg, 240 mEq/kg, 305 mEq/kg, and 370 mEq/kg). 3. The performance characteristics measured included body weight (BW), body weight gain (BWG), feed intake (FI), feed conversion (FCR) and body weight birds slaughtered (BWS). 4. The bone variables assessed in the femur were weight (WE), relative bone weight (RBWE), length (L), width (WI), maximum load supported (MLS), bone-breaking resistance (BR), and Seedor index (SI). In addition, the expression of  CHP1, SLC9A1 , and  SLC24A3  in the livers, intestines and kidneys of birds was evaluated. 5. The DEB level of 370 mEq/kg, at Na +  content of 0.48%, resulted in the highest averages for L, MLS, and BR of the femur. This DEB level increased the expression of  SLC9A1  in the liver and  SLC24A3  in the intestine. A 240 mEq/kg DEB level decreased the expression of  CHP1  in the liver, while supplementation with 110 mEq/kg increased the expression of  SLC24A3  in the kidney. 6. In conclusion, 370 mEq/kg DEB improved FCR and increased the mean bone characteristics of the femur (L, MLS, and BR) and the expression of  SLC9A1  and  SLC24A3  in the liver and intestine, respectively. These findings should be considered in future assessments of the effects of DEB levels on broilers.

british poultry science

Analysis of performance, bone characteristics, and expression of genes involved in the balance of ionic concentrations in broilers subjected to dietary electrolyte balance levels