The objective of this work was to evaluate the effect of the substitution of corn by cassava peel (CP), in complete rations for growing goats, on the nutrients intake, nutrient digestibility, average daily weight gain and the economical analysis of the rations. Twenty four females Saanen were used, with medium initial weight of 24,20± 2,28 kg and medium age of 10 months. The animals received a complete ration with 59% of hay of Coast-cross (Cynodon dactylon L.) (7,08% PB) and the treatments consisted of the substitution of the corn for the cassava peel, in growing levels (T0 = 0%; T33 = 33%; T66 = 66%; T100 = 100%). The experiment was in randomized block design with four treatments and six replicates. The medium daily intake of dry matter (DM), organic matter (OM), crude protein (CP), carbohydrates no fibrous (FNC) and total carbohydrates (TC) presented a decreasing linear effect, while the acid detergent fiber (ADF) intake presented a quadratic effect, with the substitution of the corn for the CP. Already for neutral detergent fiber (NDF) intake there were not significant differences. The digestibility coefficients of DM, OM, CP, NDF, ADF and gross energy (GE) presented a decreasing linear effect. The medium daily weight gain were: 97,70; 83,33; 45,90 and 23,84 g/animal, respectively, for the treatments T0; T33; T66 and T100. The economical analysis of the experiments rations shows that is economically viable to use until the level of 33% of substitution of the corn for CP.
feeding; by-product; nutrition; food evaluation
