The research was conducted to determine the influence of benzoic acid on growth performance, carcass
traits, blood parameters and meat chemical composition of broiler birds. The research was carried out
using 90 three weeks old broilers (Ross 308) divided into three groups, 30 per each. The levels of inclusion of the benzoic acid was based on treatment 1 (control) 0%, treatment 2 = 0.4% and treatment 3
= 0.8%. Results showed that, feeding benzoic acid to broilers had no significant on body weight, weight
gain, feed intake and feed conversion at the two tested levels. Carcass traits did not show significant
differences for the treatments, with the exception of bursa weight significantly increased. The serum
total protein and globulin were significantly (P<0.05) increased in benzoic acid supplemented broilers.
However, no significant differences were observed in serum albumin, triglyceride, cholesterol and uric
acid between different experimental groups. No significant differences were observed for hematological
parameters among all treated groups. There were no significant differences in chemical composition
of broilers meat, including dry matter, protein and ash content. It could be concluded that, dietary inclusion of benzoic acid at both levels improved the immune response by increasing the weight of bursa
of Fabricius and elevating blood globulin level but did not affect broiler chickens growth performance.