The experiment tested Acacia auriculiformis leaves’ powder actions on broilers’ growing performance and their blood plasma lipid profile. So, an experiment with 150-day-old broiler chicks was set. At the end of week 3, all the broilers were weighed, and 10 homogenous groups of 12 chicks each were constituted, within whose 5 groups per gender. Also, Acacia auriculiformis (Aa) leaves were collected, dried during 2 weeks in laboratory rooms, and were powdered with a blender. Then, in addition to a control diet, 4 diets were made by incorporating 0.75%, 1.5%, 2.25% and 3%Aa leaves’ powder. So, the diets were 0%Aa, 0.75%Aa, 1.5%Aa, 2.25%Aa, and 3%Aa, respectively. Randomly, each broilers’ group was fed on a diet for 7 weeks and the birds were weekly weighed. At the end of week 10, 3 broilers of similar weights were slaughtered per group. Their blood was collected in 2 types of tubes, for blood cells count, and blood plasma lipid analysis. As a result, white blood cell (WBC) counts were 22.80, 21.52, 20.28 and 18.11*103/µL, with diets 0%Aa, 2.25%Aa, 1.5%Aa, and 3%Aa, respectively. Thus, this WBC count decrease confers an antibiotic action to Aa leaves powder. Following, HDL cholesterol content increased from 31.62 for diet 0%Aa to 37.80 mg/dL for diet 1.5%Aa (+6.18 mg/dL, p<0.001). Simultaneously, with 1.5%Aa, triglyceride content was the smallest for 21.03 mg/dL (p<0.001), and protein content was the highest for 4.01 g/dL. In conclusion, at 1.5% in the diet, Acacia auriculiformis leaves’ powder may be very beneficial to broilers’ organic rearing.