Effect of vitamin E and selenium on the immune response of chickens against living Newcastle Disease vaccine

The immune response of chicks vaccinated with living Newcastle disease vaccines was significantly improved by vitamin E and selenium supplemented in diet 14 days before vaccination, at a ratio of 300 mg/kg and 0.25 ppm respectively, as measured by haemagglutination inhibition [HI] antibody titres and protection rate against challenge with velogenic Newcastle disease virus. Supplementation of vitamin E resulted in significant [P<0.05] increase of the final body weight and reduction of feed convertion efficiency