Different responses of broilers at low, high, or cyclic moderate-high temperatures to dietary sodium bicarbonate supplementation due to differences in dietary formulation

Abstract

0es; temperature and NaHCO ₃ cant NaHCO ₃ ificant overall effect on production parameters but significant NaHCO ₃ × temperature and NaHCO ₃ × diet interactions were observed for BWG. Sodium bicarbonate improved BWG at constant 31high (25°derate—high (25°—35cyclic moderate—high (25°—35°C) temperature regimens. Dietary formulations using typical Australian feed ingredients and varying in protein sources were used with one diet containing only animal-source protein ingredients (Diet 1) and the other diet containing predominantly plant-source protein ingredients (Diet 2). Feed intake and bodyweight gain (BWG) of broilers exposed to constant high or diurnal cyclic temperature regimens were similar and significantly poorer than those of broilers exposed to low temperatures. Dietary supplementation with NaHCO ₃ had no significant overall effect on production parameters but significant NaHCO ₃×temperature and NaHCO ₃×diet interactions were observed for BWG. Sodium bicarbonate improved BWG at constant 31°C, but not at constant 20NaHCO ₃ × temperature and NaHCO ₃ cant NaHCO ₃ ificant overall effect on production parameters but significant NaHCO ₃ × temperature and NaHCO ₃ × diet interactions were observed for BWG. Sodium bicarbonate improved BWG at constant 31high (25°derate—high (25°—35cyclic moderate—high (25°—35°C) temperature regimens. Dietary formulations using typical Australian feed ingredients and varying in protein sources were used with one diet containing only animal-source protein ingredients (Diet 1) and the other diet containing predominantly plant-source protein ingredients (Diet 2). Feed intake and bodyweight gain (BWG) of broilers exposed to constant high or diurnal cyclic temperature regimens were similar and significantly poorer than those of broilers exposed to low temperatures. Dietary supplementation with NaHCO ₃ had no significant overall effect on production parameters but significant NaHCO ₃×temperature and NaHCO ₃×diet interactions were observed for BWG. Sodium bicarbonate improved BWG at constant 31°C, but not at constant 20°C, or in the diurnal cyclic temperature regimen. Sodium bicarbonate significantly improved BWG with Diet 2 (plant-source proteins), which contained an arginine : lysine ratio of 1.31 but not with Diet 1 (animal-source proteins), which contained an arginine : lysine ratio of 1.01.