Effect of Chromium Methionine Supplementation on Performance and Serum Metabolites in Broiler Chickens Thermoneutral and Under Heat-Stress Conditions

The effects of chromium methionine supplementation on performance and serum metabolites were evalu-ated in broiler chickens. Two experiments were conducted at 22 oC, thermoneutral, (TN) and 33±2 oC, heat stressed (HS) conditions. Two hundred and eighty eight male broiler chicks (Ross 308) were allocated to four treatments in a completely randomized design. Treatments with 0 (control), 200, 400 or 800 ppb of chromium methionine for 42-d experimental period carried out. Serum metabolites and performance were determined. Supplementing the diet of TN and HS conditions broilers with chromium methionine improved feed intake (FI) and body weight (BW) (P < 0.05), but Feed conversion ration (FCR) of broilers was not af-fected by different levels of supplemental chromium. Chromium methionine increased serum HDL con-tents, but decreased glucose, (GLU), cholesterol (CHL), triacylglycerol (TG) and LDL concentrations (P < 0.05) in both TN and HS temperature. The results of these experiments indicated that supplementation of chromium methionine in the ration improved performance and influenced serum metabolites on ther-moneutral and heat-stressed broiler.