| dc.description.abstract | Information of maternal derived antibody (MDA) and onset of immunity
after vaccination is important to determine appropriate vaccination programme of
chickens. The aim of this study was to evaluate duration of Infectious Bronchitis
(IB) MDA and evaluate onset of immunity Newcastle Disease (ND) vaccination
among layers. All layers were vaccinated using live ND and Infectious Bursal
Disease (IBD) at one day old age, and received Avian Rhinotracheitis (AR)
vaccine at 4 day old age. Serum samples were collected at various ages: 7, 10, 14,
20, 22, 24, 29 and 35 day old. The presence of ND antibodies was measured by
the hemagglutination inhibition (HI) test, whilst the presence of IB antibodies was
measured by enzyme-linked immunosorbent assay (ELISA). Our study showed
that ND antibodies were at positive level until 24 day old age, and reached
protective level ≥ 25 only at 7 day old age, whilst IB MDA were positive up to 17
day old age. This result indicating the needs of ND booster vaccination at least at
24 day old and IB vaccination at 17 day old age. | id |
