Essential oils, extracts, their components, and other non-antibiotic beneficial additives are becoming increasingly popular as naturally occurring immunomodulatory agents. A study was conducted to evaluate the effects of a blend (hereafter refers to as ImmunoMax (IMX)) of peppermint, coneflower, thyme, propolis, and prebiotic on performance, immune response, hematological indices, and serum biochemistry of broiler chickens. A total of 300 day-old broiler male chicks were randomly assigned to 4 treatments: control (A) (not treated), 0.25 mL/L (B), 0.5 mL/L (C), and 1 mL/L (D) supplementing drinking water with IMX on alternate days, starting at day 21. The results demonstrated a higher body weight gain (BWG) and feed intake (FI) in groups B, C, and D (P < 0.05) with no significant difference in FCR. The results also revealed a superior immune response to NDV, IB, and IBD (P < 0.05), albeit no constant linear response. The largest portion of the heterophil, the smallest amount of the lymphocyte, and therefore the highest heterophil-to-lymphocyte ratio (H:L) were observed in the control group, while the lowest ratio belonged to groups B and C (P < 0.05). Hemoglobin content, hematocrit, total number of red blood cells (RBC), and white blood cells (WBC) were also affected by IMX, showing a significant rise compared to the control group (P < 0.05). Administering 0.25 mL/L of IMX resulted a higher thigh and breast yield as well as the smallest amount of abdominal fat (P < 0.05). The serum content of total protein (TP) and albumin (ALB) was superior in groups receiving 0.25 and 0.5 mL/L of IMX; these treatments also yielded an inferior content of glucose (GLU), triglycerides (TG), cholesterol (CHOL), LDL, and VLDL, in addition to causing the highest content of HDL (P < 0.05). The results obtained in this study revealed the immunomodulatory efficacy of a standardized natural multidrug, IMX, thereby improving the performance and carcass yield of modern broiler chickens with the optimal dosages of 0.25 and 0.5 mL/L.
Keywords: Broiler; Herbal extract; Immune response; Performance; Serum biochemistry.
© 2022. The Author(s), under exclusive licence to Springer Nature B.V.