Comparative Study of Antibody Titers Obtained from Avinew, Lasota, and Clone30 Vaccines in Broiler Chicks with Hi Test

Newcastle disease is an important viral disease, that its occurrence and virulence was increase in Iran in recent years. Therefore, in order to control the disease incidence effective vaccination program has been important. The objective of this study was comparison 3 types of vaccines include La Sota, Avinew, and Clone30 on broiler chickens. In this study 360 day old, Ross broiler chicks divided into 4 groups (A, B, C, and D) that each group consists of 3 replicate, and each of them contains 30 chicks. In group A, Avinew; B, La Sota; and C, Clone30 vaccine was used. Group D was control group and Newcastle vaccine was not used in this group. All rearing conditions was same in all 4 groups and on days 1, 15, 28, and 43 their blood samples were obtained for determination of Newcastle vaccines' antibody titers; for this purpose HI serological test was used. Results showed that, vaccinated groups (A, B, and C) showed meaningful antibody titers compared with control group (D) after 28 day(p<0.05), but in control group (D) maternal immunity's antibody titer after 28 days decreased significantly such that control's have no immunity against Newcastle disease after 28 day and susceptible to the disease. Antibody titers that obtained from Avinew, La Sota, and Clone30 vaccines didn't show any significant difference (p>0.05), however considering more reactions to vaccination reaction of La Sota vaccine compared with Avinew and Clone30 vaccines, Avinew and Clone30 vaccines better than La Sota vaccine regarding vaccine reactions and preferable herein.