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Diterima: 1 Maret 2019 Disetujui: 30 Maret 2019 Dipublikasikan: 25 April 2019 Infectious bronchitis (IB) is a disease that attacks the chicken's respiratory system caused by an infectious bronchitis virus. IB transmission can occur directly and indirectly. IB disease transmission can be done by vaccination. Vaccination can fail so that to determine the success of the vaccination program an antibody titer monitor is performed using serological tests. ELISA is one of the serological tests that can be used to measure antigens/antibodies. The main principle of the ELISA technique is the use of enzyme indicators for immunological reactions. This study aims to analyze the differences in chicken antibody titers at certain periods after vaccination. The sample in this study used 18 female layer hens of Hisex Brown Strain aged 20 weeks that were vaccinated by IB. This study was an experimental study with treatment of antibody titer measurements at 7, 14, and 21 days after vaccination. Data analysis is descriptive quantitative using the Normality test and t test. The mean results of antibody titers at each consecutive time period at 7, 14, and 21 days after vaccination were 1695, 4207, and 5978. The results of the t test showed that at each sampling period 7 dpi, 14 dpi and 21 dpi had differences significant. The number of titers of IgG antibodies to the IBV virus increases from a distance after vaccination. Conclusions were obtained that antibodies increased in each period of time taken after vaccination.

Analisis Perkembangan Titer Antibodi Hasil Vaksinasi Infectious Bronchitis pada Ayam Petelur Strain Hisex Brown