The Thai Journal of Veterinary Medicine


Native chickens raised in the village from 24 families were divided into 4 groups. Group 1 were vaccinated with Newcastle disease vaccine {NDV} once a year by using F strain for the chickens under 2 months of age and M.P. {Mukteswar} strain for those over 2 months of age. Group 2 were vaccinated with the same vaccines and at the same age as Group 1 but twice a year. Group 3 and 4 were vaccinated with NDV F strain three and four times a year respectively. In addition, a group of chickens from 30 families were also used as unvaccinated control. Postvaccination mortality, immune response and mortality due to diseases were recorded. Mortality after vaccination with NDV F strain were 7.69% in Group 1, 13.04 and 4.67% in Group 2, 10.71, 28.97 and 0% in Group 3 and 22.22. 17.54. 0 and 2.41% in Group 4 {average for all group was 10.43% while mortality after vaccination with NDV M.P. strain were 8.11% in Group 1 and 26.90 and 0% in Group 2 faverage 11.68%}. HI titers in one year round were highest in Group 1 and lower in Group 2 and 4 and lowest in Group 3. Mortality due to diseases in Group 1, 2,3 and 4 were 1.38, 4.80, 4.83, and 2.86% per month respectively compared to 15.95% in the unvaccinated control group.



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