Abstract
Swain, B.K., John, T.S. and Majumdar, S. 2000. Effect of supplementation of different combinations of vitamin A and zinc on the performance and immune response of broilers. J. Appl. Anim. Res., 17: 273–278. A study was conducted with broilers to find out the effect of supplementation of vitamin A (0, 4500, 8500 and 12500 IU/kg) and zinc (0, 30 and 60 mg/kg) to a basal diet containing vitamin A, 1500 IU/kg and zinc, 35 mg/kg) in a factorial experiment in randomised design. Optimum growth, best feed efficiency and maximum cellular response were observed in chicks fed diet supplemented with 12500 IU/kg vitamin A and 60 mg/kg zinc. Both HI and ELISA titres were peaked at d 10 post immunisation. Maximum humoral immune response was obtained on diet supplemented with vitamin A and Zn levels of 12500 IU/kg and 30 mg/kg, respectively.
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