Immunosurveillance Of Major Virus Diseases In The Jishiba Fowl-run, Wudu County

The maternal antibodies of Newcastle disease(ND) and infectious bursal disease(IBD) were detected respectively by means of haemagglutination Inhibition(HI) and agar gel immunodiffusion(AGID) in the moderate-scaled fowl-run in Jishiba, Wudu county. The results showed that the HI titer on maternal antibody of Newcastle disease virus was 4.4 and the positive rate on antibody of infectious bursal disease virus was 55%. Referring to relative immunization schedule, a primary immunization-plan was established. Using HI, The immune effect of Newcastle Disease vaccines was detected and analyzed. The HI titers on antibodies of ND vaccines when the chickens grew up at 34, 39, 59, 75, 119 and 135 day-old were 5.20,4.80, 5.50, 6.25, 7.35 and 8.40 respectively. AGID was applied to detect and analyze the immune effect of IBD vaccine, MD vaccine and IB vaccine. The antibody positive rates of IBD when the chickens grew up at 14, 19, 24, 29, 34, 39, 44and 49 day-old were 30%, 20%, 40%, 50%, 40%, 60%, 70% and 90% respectively. The antibody positive rates of MD vaccine when the chickens grew up at 24, 29, 34, 39, 44, 59 and 135 day-old were 0%, 10%, 40%, 40%, 30%, 0% and 0% respectively. The antibody positive rates of IB vaccine when the chickens grew up at 24, 34 and 59 day-old were 20%,30% and 50% respectively. AGID was applied to detect the serum antibody level of AI and ILT. The results indicated the antibody positive rates of AI when the chickens grew up at 3 and 4 month-old were 10% and 20% respectively. According to the experimental results, an immunization schedule suitable for the moderate-scaled fowl-run was proposed.