Effect of vitamin E and L-carnitine on growth performance, blood parameters and immune response of broiler chickens under heat stress

This study was conducted to investigate effects of different levels of vitamin E (0, 100 and 200 mg/kg) and L-carnitine (0, 50 and 100 mg/kg) on growth performance and some blood and immune parameters of broilers under heat stress, using completely randomized design with 3Í3 factorial treatment arrangement and 4 replicates pertreatment. Heat stress was induced from the beginning of forth week. Performance parameters were recorded weekly. At 28 and 35 days of age, antibody titer against SRBC was determined. At 42 days of age, blood samples were collected and carcass characteristics analysis was done. Levels of vitamin E and L-carnitine had no significant effect on performance parameters. Vitamin E increased the weight of the bursa of fabricius (P