The efficacy of thermostable I-2 Newcastle disease vaccine in broiler quails

摘要

The thermostable Newcastle disease vaccine produced by NAVETCO has proved effective in chickens. In Vietnam Japanese quail also die of Newcastle disease. Experiments were undertaken to test the efficacy of the vaccine in broiler quail. Antibody responses and resistance to challenge with virulent Newcastle disease virus were measured. I-2 vaccine produced a serological response in quail after administration on food or in drinking water, but at levels lower than those that would be expected in chickens. Despite poor antibody responses, high rates of protection against experimental challenge were recorded at 21 days of age in quail vaccinated at 3 days of age, and at 35 days in quail vaccinated at 3 and 21 days of age.