The aim of this study was to evaluate the effects of replacing corn silage by coffee hulls treated with calcium oxide (CaO) on growth performance, carcass traits and meat quality parameters of lambs. Twenty-eight crossbred, non-castrated male lambs, weaned at three months of age with average initial body weight of 20.24 ± 2.40 kg were housed in individual pens. Lambs were randomly assigned to one of the four experimental treatments, which consisted of increased feeding levels of treated coffee hulls (TCH) (0, 80, 160 and 240 g/kg on DM basis). The forage concentrate ratio was 50:50 on dry matter (DM) basis and the diets were formulated to supply nutrient requirements of growing lambs with average daily gain (ADG) of 200 g. After 66 days of experimental period, lambs were slaughtered for further carcass traits and meat quality evaluations. As results, increased feeding levels of TCH in the diets led to a quadratic effect on intake of DM and its components (P < 0.05), values were highest at the intermediate addition level. Moreover, as level of TCH increased in the diets, both DM and crude protein (CP) apparent digestibility declined linearly (P = 0.001). However, apparent digestibility of neutral detergent fiber corrected for ash and protein contents (apNDF), ether extract (EE) and non-fiber carbohydrates (NFC) were not influenced by treatments (P > 0.05). Values of final body weight and ADG were similar up to 160 g/kg of corn silage replacement. A quadratic effect was observed for shear force (WBSF) (P = 0.029), the only meat quality parameter that showed significant effect. Lower values of WBSF were observed at the intermediated levels of corn silage replacement. Coffee hulls treated with CaO can be used as corn silage substitute at levels up to 160 g/kg because lambs performance and meat quality are not affected.