Abstract

This study was design to determine the level of Immunity in brioler that vaccinated with different methods and strains of Newcastle virus vaccine in Brioler farms in Kurakosh region to know which one is the best. Acomparison was made between three farms programs vaccinated against Newcastle disease in briolers breeds hubbard and cobb. The result of Haemagglutination inhibition test (HI) shows presence of specific Antibodies in the sera of all birds vaccinated at different levels, The Programe (one) show highest antibodies titer in the sera of birds vaccinated by drinking water (DW) at 20 days post vaccination Log2(0.86) with out significant difference than other vaccinations P<0.05. Program (two) show highest antibodies titer in the sera of birds vaccinated by D.W. at 18 day Log2 (0.76) with significant difference than other vaccinations P<0.05. Program (three) show highest antibodies titer in the sera of birds vaccinated by DW at 25 days Log2 (0.76) with out significant difference than other vaccinations P<0.05.