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Avian coccidiosis, an important protozoal disease of chicken triggered by coccidian protozoa of genus Eimeria, causes considerable economic losses to broiler producers. The study was designed to assess the efficiency of Origanum majoranum aqueous extract (OMAE) on E. tenella-infected broiler chicken. Birds were divided into four groups including: positive control (PC, challenged with 5×10 4 sporulated oocysts of E. tenella at the 12 th day of age), PC+OMAE (challenged with E. tenella oocysts at the 12 th day of age and received OMAE (125 mg/kg BW) orally, started at the 7 th day of age, and continued for 14 consecutive days), OMAE (received OMAE (125 mg/kg BW) orally, at the 7th day of age, for 14 consecutive days), and negative control (received basal diet only). Anticoccidial efficacy of OMAE was evaluated by complete blood picture, serum chemistry, serum protein electrophoresis, antioxidants markers, cecal oocysts count, and cecal lesions score. Briefly, collected data indicated that supplementation of OMAE could increase antioxidants concentrations and improve changes in hematobiochemical parameters and serum protein fractions, as well as decrease cecal oocysts count and reduce cecal lesion scores in E. tenella-infected birds. In conclusion, OMAE restores oxidant-antioxidant balance, and its supplementation in broiler chicken can alleviate E. tenella-infection and reduce its severity.

Anticoccidial effect of Origanum majoranum aqueous extract on Eimeria tenella-infected chicken