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In an experiment with 45 male growing Chios lambs, the effect of dietary dried oregano (Origanum vulgare subsp. hirtum) leaves supplementation on performance and carcass characteristics was determined. In the 10 wk experiment, lambs were allocated to 1 of 3 treatments (OR0, OR144, and OR288) of 15 lambs each. Lambs had an initial body weight (BW) of 17.5±1.8kg, and were fed a concentrate mixture ad libitum and alfalfa hay at 0.4kg/(lambd). The concentrate mixture for treatment OR0 was not supplemented with dried oregano leaves (control), while dried oregano leaves were incorporated into the concentrate mixture of treatments OR144 and OR288 at levels of 4 and 8kg/t, respectively, to provide oregano essential oil at levels of 144 and 288mg/kg of concentrate, respectively. No differences were observed among dried oregano leaves inclusion treatments in final BW (36.7kg), BW gain (BWG, 275g/d), dry …