Evaluation of humoral immunity by IgG measurement in broilers vaccinated with life and killed Newcastle vaccine

Current research objectives evaluated the humeral immunity induced by two different vaccination methods and estimated efficiency of commercially available Newcastle disease (ND) vaccine. A total number 90-day-old unvaccinated chicks were divided equally into 3 groups; each group was vaccinated with methods, while control group. Serum collected from all groups, five chickens slaughtered. ELISA measured levels IgG; there also higher in groups (G1, G2) compared Group 2 had best The values lymphoid organs (Bursa Fabricius, thymus spleen) indices in. While to non-vaccinated between no significant difference (P < 0.05). best-proven vaccine program 2(primary at 7th day old intraocular (live vaccine), then boost potion dose 21st drinking water vaccine(live vaccine). Keywords: chicks, immunity,