Lambs fed with increasing levels of grape pomace silage: Effects on productive performance, carcass characteristics, and blood parameters

•Inclusion of grape pomace silage from Vitis vinifera (cv. Bordeaux) to replace whole plant corn silage in diet of lambs modified feed conversion, weight gain and feed evaluation.•The lambs performance was altered with inclusion of grape pomace silage due to higher presence of lignified fractions.•Due to the higher lipid content of diets with grape pomace silage, carcass fat of lambs modified.•Copper levels identified in grape pomace silage did not cause poisoning in lambs. Grape pomace in sheep diet can keep the nutritional supply constant, however, due to extensive productive variability, grape residue may present nutritional and toxicological limitations. This study aimed to evaluate the productive performance, carcass characteristics, and blood parameters of lambs submitted to diets with increasing levels of grape pomace silage (GPS) as a partial replacement for whole corn silage. Twenty-four male lambs were fed diets with increasing GPS levels using a 50:50 forage/concentrate ratio. Chemical characterization of the diet, intake, weight gain and feed conversion, carcass characterization, and blood and histological evaluations were performed. A linear negative effect (p