
There are varieties of agents that can impair the normal resistance mechanism of birds. The presence of such agents in modern poultry operation is of great importance as they can directly affect performance of birds and incidence of diseases. One of the most common immunosuppressive agents in poultry is mycotoxin produced by fungi. Various species of poultry differ in susceptibility to acute and sub-acute aflatoxicosis. This work was carried out to study the role of locally available herbal plant extracts such as Azadirachta indica, Cynodon dactylon and Curcuma longa in counteracting the effects of experimental aflatoxicosis in laying Japanese quail by feeding them with diets containing aflatoxin at 1.5 and 3 ppm levels for a period of six weeks.