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RESUMOObjetivou-se avaliar a inclusão de ureia e glicerina bruta como aditivos na ensilagem da cana-de-açúcar, na composição químico-bromatológica, pH, N-amoniacal (N-NH 3 ) e digestibilidade in vitro (DIV). Os tratamentos foram quatro doses de ureia, 0, 10, 20 e 30 g de ureia por kg de cana-de-açúcar na ensilagem, e cinco doses de glicerina bruta, 0, 10, 20, 30 e 40g de glicerina bruta por kg de cana-de-açúcar na ensilagem. As silagens foram armazenadas por 180 dias. O tratamento com ureia afetou a maioria das variáveis relacionadas ao valor nutritivo, aumentando os teores de matéria seca (MS) e proteína (PB) (2,58; 7,76; 18,70 e 19,31%), reduzindo os teores de fibra em detergente neutro (FDN) e melhorando a DIV da MS (42,61; 48,53; 50,69 e 51,18%) e FDN (38,81; 39,23; 41,06 e 43,46%), e as características fermentativas da silagem, apresentando valores de pH de 3,49; 3,86; 4,18 e 3,93 e de N-NH 3 de 1,72; 3,80; 7,88 e 9,00, para as dose de 0, 10, 20 e 30 g, respectivamente. A glicerina bruta aumentou os teores de MS e extrato etéreo (1,45; 3,03; 3,62; 3,41 e 4,38%), melhorou a DIV da MS com valores de 49,61; 52,24; 53,28; 55,60 e 56,09% e reduziu perdas por gases durante o processo de fermentação, apresentando médias de 6,69; 5,97; 5,89; 5,51 e 5,48% da MS para as doses 0, 10, 20, 30 e 40g, respectivamente. Assim, a ureia e a glicerina bruta podem ser utilizadas como aditivos na ensilagem da cana-de-açúcar.Palavras-chave: conservação de forragem, glicerol, silagem sugar cane, in chemical composition, pH, ) and in vitro digestibility (IVD) (2.58, 7.76, 18.70 and 19.31%) and reduced levels of neutral detergent fiber (NDF) and improved IVDDM (42.61, 48.53, 50.69 and 51.18%) and NDF (38.81, 39.23, 41.06 and 43.46%) and fermentation characteristics of silage, with pH values of 3.49, 3.86, 4.18 and 3.93 and NH3 1.72, 3.80, 7.88 and 9.00 for the dose of 0, 10, 20 and 30 g, respectively. The crude glycerin increased in DM and ether extract (1.45, 3.03, 3.62, 3.41 and 4.38%), improved IVDDM with values of 49.61, 52.24, 53 28; 55.60 and 56.09% and reduced gas losses during the fermentation process with mean of 6.69, 5.97, 5.89, 5.51 and 5.48% of DM for the doses 0, 10 , 20, 30 and 40g, respectively. Urea and crude glycerin can be used as an additive in ensiling of sugar cane. ABSTRACT The aim of this study was to evaluate the inclusion of urea and crude glycerin as an additive in ensiling of

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ABSTRACT. Agroindustrial co-products are a viable alternative for use in animal nutrition. Tests were conducted using eight different types of co-products and feed to evaluate the chemical composition, in vitro digestibility of dry matter, crude protein and neutral detergent fiber, and gas production by them. The coproducts tested were: coffee hulls; pelleted citrus pulp; grape residue; soybean hulls; cottonseed; cassava foliage; and foods usually supplied to ruminants: corn silage and ground corn concentrate. Data of in vitro digestibility of dry matter, crude protein and neutral detergent fiber were tested by analysis of variance using the least square method; the results of gas production were interpreted by a non-linear regression by the Gauss-Newton method; and the effects of treatments were evaluated by the Tukey's test. The coefficients of in vitro digestibility of dry matter, crude protein and neutral detergent fiber of co-products were different. Gas production was also different between co-products and feeds evaluated for the volume of gas produced from the fast and slow degradation fractions, degradation rate, bacterial colonization time, and the total volume of gas produced. The evaluated coproducts exhibited greater in vitro dry matter digestibility compared to corn silage, except for cottonseed, grape residue, and cassava foliage. Co-products showed higher values of in vitro crude protein digestibility compared to corn silage, and a reduced in vitro digestibility of neutral detergent fiber, except for pelleted citrus pulp and soybean hulls. Corn silage produced larger volume of gas from the fast degradation fraction compared to the coproducts and corn concentrate. Co-products analyzed had appropriate nutritional characteristics according to the techniques applied and can be included in ruminant diets.Keywords: alternative feed, degradation, fermentation, gas production.Avaliação do valor nutricional de coprodutos da agroindústria e de alimentos por meio da composição bromatológica, da digestibilidade in vitro e da técnica de produção de gás RESUMO. Os coprodutos da agroindústria constituem uma alternativa para a utilização na nutrição animal. Foram realizados ensaios com oito tipos de coprodutos e alimentos para avaliar a composição bromatológica, a digestibilidade in vitro da matéria seca, a proteína bruta e a fibra em detergente neutro, bem como a produção de gases gerados por eles. Os coprodutos utilizados neste estudo foram: casca de café; polpa cítrica peletizada; resíduo de uva; casca de grão de soja; caroço de algodão; rama de mandioca e alimentos tradicionalmente empregados na alimentação de ruminantes: silagem de milho e concentrado de grão de milho moído. Os dados de digestibilidade in vitro da matéria seca, da proteína bruta e da fibra em detergente neutro foram interpretados por uma análise de variância, utilizando o método de quadrados mínimos; os resultados da produção de gás foram interpretados por uma regressão não linear pelo método de Gauss-Newton; e os efeitos de tratamentos fora...

Five cultivars of Urochloa brizantha (Hochst. ex A.Rich.) R.D. Webster (syn. of Brachiaria brizantha) were evaluated for nutritional value and an anti-nutritional factor (protodioscin), in order to determine whether protodioscin content was correlated with reduced feed quality. We evaluated cvv. Arapoty, Paiaguas, Xaraes, Marandu and Piata and grouped the results into summer, autumn, winter and spring seasons. Protodioscin content and chemical composition of leaves, in vitro digestibility and cumulative gas production were analysed. Data were evaluated by analysis of variance as a completely randomised experimental design in a factorial arrangement (five cultivars × four seasons). There was no significant interaction between cultivar and season. All grasses showed highest protodioscin contents during autumn. Protodioscin contents ranged from 5.6 g kg–1 (spring) to 19.2 g kg–1 (autumn). Crude protein content varied significantly across seasons. No significant effect was detected for neutral detergent fibre (NDF) content among seasons. Cultivar Arapoty showed the highest NDF content in summer (669.3 g kg–1) and the lowest in spring (601.9 g kg–1). The best in vitro digestibility coefficients were observed in spring. The protodioscin content of U. brizantha cultivars can negatively affect their digestibility and some parameters of cumulative in vitro gas production.