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¹ Adekunle Ajasin University, Faculty of Agriculture, Department of Animal Science, Akungba-Akoko, Nigeria DOI : 10.46897/livestockstudies.1418212 - This study assessed the effect of dietary supplementation of Crassocephalum crepidioides (CCLM) and Chenopodium ambrosioides L. (CALM) leaf meals on relative growth rate, oxidative stress biomarkers, immune response, serum and meat antioxidative enzymes of broilers. A total of 120 one-day-old Cobb 500 chicks were randomly assigned to four dietary treatments (three replicates of 10 birds/treatment) as follows, Diet 1 (basal/control diet), Diet 2 (basal +200mg/kgVitC), Diet 3 (basal +2500mg/kgCCLM) and Diet 4 (basal +2500mg/kgCALM) for 42 days. The result revealed that supplementation of CCLM and CALM significantly reduced (P < 0.05) the concentration of heat shock protein and hydroxy-2-deoxyguanosine in broilers compared to the control group. Broilers fed diet containing CCLM and CALM exhibited higher (P < 0.05) serum glutathione peroxidase content compared to the control group. The level of immunoglobulins were significantly higher in birds fed diet containing CCLM, CALM and Vit C compared to control group. However, supplementation of CCLM and CALM did not influence (P > 0.05) the relative growth rate and antioxidant content of breast muscle compared to control group. It`s concluded that CCLM and CALM could be used as natural additive to alleviate oxidative damage, improve immune system and serum antioxidant content of broilers. Keywords : Broiler Immune system Leaf meal Supplement Stress biomarkers