The effect of vitamin E, L-carnitine, and ginger on production traits, immune response, and antioxidant status in two broiler strains exposed to chronic heat stress.

The present study was designed to find the effect of natural and synthetic antioxidants on the performance of two broiler strains under high ambient temperature. A total of 320 day-old chicks of Hubbard and Cobb were reared for a period for 21 days under the same nutritional and management systems. On day 21 onward, one subgroup was kept as control while other subgroups were provided with vitamin E (250 mg/kg), ginger (2 g/kg), and L-carnitine (500 mg/kg) in basal diets. Body weight and feed conversion ratio (FCR) were significantly (P < 0.05) high in vitamin E-supplemented birds, while feed intake was significantly (P < 0.05) higher in L-carnitine supplemented birds irrespective of the strain. Antibody titer against infectious bursal disease (IBD) and paraoxonase (PON1) was significantly (P < 0.05) higher in vitamin E-supplemented birds compared to the other treatments. The number of heterophils and toal oxidant status (TOS) were significantly (P < 0.05) lower in vitamin E-supplemented birds. Blood glucose was significantly (P < 0.05) lower in vitamin E-supplemented birds, while total protein was significantly (P < 0.05) higher in vitamin E-supplemented group. In conclusion, the supplementation of vitamin E at the rate of 250 mg/kg improved the antioxidant status and immune response in the two broiler strains. Further, the two strains perform similarly in terms of performance and other health status parameters with no significant difference.