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Online Journal of Veterinary Research

Volume 21 (12):798-801, 2017.

Effect of influenza vaccination and age on immune response in broiler chickens.


Hessamoddin Zahabi, Zahra Boroomand*


Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Corresponding author: z.boroomand@scu.ac.ir


Zahabi H, Boroomand Z., Effect of influenza and newcastle vaccinations and age on immune response in broiler chickens., Onl J Vet Res., 21 (12):798-801, 2017. In poultry, low pathogenic H9N2 influenza virus reduces production and increases mortality and vaccination costs in poultry. Effect of bivalent, influenza H9N2 and Newcastle killed vaccines on humoral immune response in groups of 15000 broiler chicks of different ages are described. Groups were housed in 3 separate halls but bred under the same conditions. Chicks were then vaccinated bivalent inactivated vaccine against influenza and Newcastle disease at 1 day of age in Hall 1, 3 days in Hall 2 and 7 days of age in Hall 3. Blood was taken from 24 chicks from each group on the 1st and 7th day of week for hemaglutination tests. Results showed that vaccination on 1st and 3rd day of age not only did not increase production, but also reduced antibody titer at 35 and 42 days of age compared with those vaccinated at 7 days.


Key words: avian influenza, vaccination program, antibody titer.