Received: 27-07-2023 / Accepted: 05-01-2024
The study was conducted to evaluate antibody titers against IBDV and the productivity of commercial broiler flocks at field trial vaccinated with live vaccine Tabic MB and immune complex vaccine (IBDV-Icx). A total of 240 blood samples were randomly collected from 2 farms to test antibody titers against IBDV by ELISA technique. Mean body weight, average daily weight gain, and FCR were monitored until slaughter. The results showed that the chickens had high level of maternally derived antibodies (MDA). At 3 days old, the mean MDA was 5,582 titer units. At 30 days old, the number of positive samples with anti-IBDV (> 396 titers) in the group using Tabic MB and IBDV-Icx vaccines was 20% and 5%, respectively (P <0.05). Especially at 35 days of age, the titer at farm using the Tabic MB vaccine was 2,671 , which was significantly higher than that of the farm using the IBD-Icx vaccine, with titer of 132 only (P <0.05). Chicken body weight and average daily weight gain of this survey were similar (P >0.05). However, the FCR of chickens using Tabic MB vaccine was lower than chickens using IBDV-Icx vaccine (P <0.05). Briefly, commercial broiler chickens using Tabic MB vaccine had higher antibody titer against IBDV and productivity parameters were not affected compared with vaccinated with IBDV-Icx .