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ContextChromium (Cr) is considered a beneficial trace element. It has been reported that supplementation with Cr in the diet promotes improvements in the productive variables of broilers reared under heat stress (HS).AimThe study aimed to evaluate dose response of Cr as chromium-methionine (CrMet) supplementation on metabolisable energy, serum biochemistry, growth performance and carcass yield of broilers.MethodsThree hundred and thirty-six 22-day-old male broiler chickens were randomly assigned to four blocks, six treatments (0, 0.10, 0.20, 0.40, 0.80 and 1.20 mg/kg dry matter (DM) Cr as CrMet), eight repetitions with seven birds per experimental unit, subjected to HS (33°C for 12h/day) from 22 to 43 days. The supplemented CrMet level for each variable studied was estimated using linear and quadratic regressions.Key resultsThe bodyweight was quadratically affected at 35 and 43 days (P &amp;lt; 0.01), as well as bodyweight gain (P = 0.02) and feed conversion ratio (P = 0.01) from 22 to 43 days. A linear improvement (P = 0.03) was observed in the feed conversion ratio from 22 to 28 days and bodyweight gain for 22 to 35 days (P = 0.02). The nitrogen-corrected apparent metabolisable energy and the coefficient of metabolisation of energy were quadratically affected (P &amp;lt; 0.01 and P &amp;lt; 0.01, respectively) by CrMet levels in the diet. A quadratic response was observed on total serum cholesterol (P &amp;lt; 0.01), serum glucose (P = 0.07) and triacylglycerol (P &amp;lt; 0.01). The abdominal fat deposition was quadratically affected (P &amp;lt; 0.01) by CrMet levels in the diet.ConclusionsThe supplementation of 0.77 mg/kg DM Cr as CrMet improves performance, carcass characteristics and serum biochemistry parameters of broiler chickens reared under heat stress.ImplicationsThe results indicate that CrMet can be supplemented in the diet for broilers reared under heat stress to improve productivity of broiler chickens.

animal production science

Dietary chromium-methionine supplementation and broiler (22–43 days) responses during heat stress. 1. Growth performance and carcass yield, metabolisable energy and serum biochemistry