The effect of aflatoxins B1 (AFB1) contaminated feed on performance parameters (feed intake, body weight and feed conversion ratio) and on Immune response on antibody titers of Newcastle Disease, Infectious Bronchitis and Avian Influenza content was investigated in broiler chicks using 240 unsexed Ross 308, were randomly allotted into 4 treatments with 3 replicates having 20 chicks each i.e. Control; AFB1 (600ppb); ROS (500ppm) and AF+ROS (600ppb + 500ppm). Feed contaminated with aflatoxin B1 caused a significant (p<0.05) increase in feed conversion ratios, a decrease in body weight and a significant (P<0.05) increase in feed consumption. ND, IB and Ai titer values were increased due to aflatoxin presence in the diet. The Rosemary could essence have incompletely restored the negative impacts of aflatoxin in the diet and the better values on all studied parameters were noticed in the Rosemary alone treatment group.
