ABSTRACT: Grape pomace is a by-product that can be ensiled and added to animal feed for a sustainable animal production. This study evaluated the effects of grape pomace silage (GPS) on the intake, performance, and carcass and meat quality of feedlot lambs. Twenty-four male lambs (21.5 ± 3.0 kg initial body weight) were distributed into pairs to four diets levels 0, 10, 20, and 30 % of GPS. The addition of grape pomace silage influenced only ether extract (EE) intake linearly without hindering consumption. The diet did not affect performance and meat quality attributes and carcass parameters, with average daily gain (ADG) of 0.235 kg d−1, feed conversion 4.299, carcass conformation 2.7, compactness index 0.25 kg cm−1, fat thickness 1.51 mm, loin eye area 13.9 cm2, pH 5.79, natural matter moisture 74.05 g 100 g−1, and crude protein (CP) 19.94 g per 100 g−1 of dry matter (DM). Grape pomace as could be used as silage in lamb diets with up to 30 % GPS, as the chemical composition of this by-product and the results indicate that GPS did not compromise performance, carcass traits, and meat quality.

Objetivou-se avaliar o efeito da substituição do concentrado pelo resíduo úmido de cervejaria sobre o consumo e a digestibilidade dos nutrientes em cabras. Foram utilizadas cinco cabras mestiças Boer x Saanen e cinco cabras Saanen distribuídas em dois quadrados latinos 5 x 5. As dietas foram compostas de 40% de feno de capim-tifton e os 60% restantes foram compostos de 0, 25, 50, 75 ou 100% de resíduo úmido de cervejaria em substituição ao concentrado. Os consumos de matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), extrato etéreo (EE), carboidratos totais (CT), nutrientes digestíveis totais (NDT) e fibra em detergente neutro (FDN) ajustaram-se ao modelo quadrático, de modo que os maiores valores foram observados para as dietas sem resíduo úmido de cervejaria e com 25% desse resíduo. Os níveis de resíduo úmido de cervejaria tiveram efeito linear decrescente na digestibilidade aparente de matéria seca, matéria orgânica e carboidratos totais e efeito quadrática na digestibilidade da proteína bruta. O resíduo úmido de cervejaria pode ser utilizado em níveis de até 25% como substituto ao concentrado em dietas para cabras no final da lactação.

The aim of this work was to evaluate the effect of replacing concentrate by wet brewer grain on the intake and digestibility of nutrients in goats. It was used five Boer x Saanen crossbreed goats and five Saanen goats randomly distributed in two 5 x 5 latin squares. The diets were composed of 40% of Tifton hay and the other 60% were composed of 0, 25, 50, 75 or 100% of wet brewer grain replacing the concentrate. The intake of dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), total carbohydrates (TC), total digestible nutrients (TDN) and neutral detergent fiber (NDF) were fitted to the quadratic model so the highest values were observed for diets without wet brewer grain and with 25% of this residue. The levels of wet brewer grain had a decreasing linear effect on apparent digestibility of dry matter, organic matter, and total carbohydrates and a quadratic effect on crude protein digestibility. Wet brewer grain can be used in levels up to 25% as a substitute to concentrate in diets for goats at the end of lactation.