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Unsexed seven-day-old Sasso chicks were used to determine the effect of humic acid on productive performance, blood parameters, carcass characteristics, immune response and economical efficiency of Sasso chicks. At seven days of age 196 birds were distributed into four groups (49 birds in seven replicates). The chicks were fed basal diet and were submitted to the following dietary treatments: the first group fed a basal diets without supplementation (control), the 2, 3 and 4 groups fed the same basal diets supplemented with 0.1, 0.2 and 0.4% of humic acid. At the end of the experiment, some carcass characteristics were measured and blood samples were taken to determine some blood plasma constituents. The results reported that Sasso chicks fed 0.1% of humic acid had greater productive performance and economical efficiency than those fed basal diet (control).Chicks fed 0.1% of humic acid had significantly higher glucose than the control group. Supplementation of humic acid decreased serum AST, ALT, urea, creatinine, total lipids, triglycerides, cholesterol, HDL, LDL, MCV, MCH, á–globulin and âglobulin and increased T4, GPX, SOD, RBC’s hemoglobin, WBC’s, total protein, ãglobulin, LA, BA, LTT, phagocytic activity and phagocytic index compared to control group (within normal range). Feeding diet with 0.1 and 0.2% of humic acid significantly increased the percentage of dressing and decreased abdominal fat compared to control. Moreover, humic acid decreased bacterial count of the digestive tract compared to control group. In conclusion, humic acid supplementation at 0.1, 0.2 and 0.4% improved growth performance, nutrient digestibility, production index and economical efficiency especially at the level of 0.1%, without any adverse effects on blood components of Sasso chicken.

EFFECT OF HUMIC ACID SUPPLEMENTATION ON PRODUCTIVE PERFORMANCE, BLOOD CONSTITUENTS, IMMUNE RESPONSE AND CARCASS CHARACTERISTICS OF SASSO CHICKEN