O uso de silagem de gramíneas trópicas tem se tornado comum na alimentação de ruminante. Conduziu-se um experimento com o objetivo de avaliar o perfil fermentativo e valor nutricional da silagem de capim Tifton 85 com diferentes aditivos e emurchecimento. Os tratamentos foram: pré-secagem ao sol por 2 horas antes de ensilar, uso de inoculante bacteriano-enzimático, adição de casca de soja, adição de quirera de milho e uso de sal grosso na camada superficial do silo. O delineamento experimental foi inteiramente casualizado, com 6 tratamentos e 4 repetições. Plantas de capim Tifton 85 com 38 dias de crescimento foram ensiladas em silos experimentais com válvula tipo Bunsen com densidades de compactação de 236 kg de silagem por m³ para o Tifton 85 pré-seco ao sol e 294 kg de silagem por m³ para os demais tratamentos. As proporções de casca de soja e quirera de milho, adicionados à silagem, foram calculados com base no teor de MS inicial do Tifton 85 visando à obtenção de MS de 320 g kg-1 para o material a ser ensilado. A capacidade tampão não diferiu entre tratamentos ficando em 29,56 (meqHCl/100gMS). Verificou-se que os teores de nitrogênio amoniacal não diferiram entre as silagens e mantiveram-se baixos (32,2 g kg-1), o pH após a abertura dos silos também não diferiu com média de 4,09 ficando acima de 4,2 apenas na silagem de Tifton 85 sem pré-tratamento. Os teores de proteína bruta foram mais elevados nas silagens de capim Tifton 85 e capim Tifton 85 com casca de soja (174,8 g kg-1). O uso de quirera de milho promoveu redução nos valores de FDN. O uso de sal na camada superficial reduziu a produção de ácido acético e lático.

The use of tropical grasses silage has become common in ruminant feed. An experiment was conducted to evaluate the fermentation characteristics, nutritional value, pH, fermentative capacity, ammonia nitrogen / total nitrogen (NH3N/total N) of Tifton 85 bermudagrass grass silage with different additives and wilting. The treatments were: pre-drying in the sun for two hours before silage, use of inoculant-enzymatic addition of soybean hulls, corn grits addition and use of salt in the surface layer of the silo. The experimental design was completely randomized with 6 treatments and 4 replications. Plants of Tifton 85 bermudagrass with 38 days of growth were ensiled in experimental silos with Bunsen valve type with packing densities of 236 kg of silage per m³ for Tifton 85 bermudagrass pre-dried in the sun and 294 kg of silage per m³ for the other treatments. The proportions of soybean hulls and corn grits added to the silage were calculated based on the initial DM content of Tifton 85 bermudagrass order to obtain MS 320 g kg-1 for the material to be ensiled. The buffering capacity did not differ between treatments in getting 29.56 (meqHCl/100gMS). It was found that the concentration of ammonia nitrogen did not differ between silages and remained low (3.22 g kg-1), the pH after silo opening was also similar with an average of 4.09 getting above 4.2 only in Tifton 85 bermudagrass silage without pre-treatment. The crude protein was higher in silages Tifton 85 bermudagrass and Tifton 85 bermudagrass with soybean hulls (17.48 g kg-1). The use corn grits caused a reduction in the values of NDF. The use of salt on the surface the layer reduced the production of latic and acetic acid.

J.P. Ames, M.A. Neres, D.D. Castagnara, L.M. Mufatto, C. Ducati, C.C. Jobim, and T.T. Tres. 2014. Dry matter production, chemical composition, dry matter digestibility and occurrence of fungi in Bermuda grass hay (Cynodon dactylon) under different fertilization systems or associated with pea plantings in winter. Cien. Inv. Agr. 41(2): 163-174. This study aimed to evaluate the structural characteristics, dehydration curve, DM production, chemical composition, in vitro dry matter digestibility and occurrence of fungi in Bermuda grass hay (Cynodon dactylon cv. 'Bermuda grass', Tifton 85) produced in winter under different forms of fertilization or in association with a winter annual legume. The experimental design used was a randomized block with split plots in time and with four treatments: Bermuda grass without fertilization or intercropping, Bermuda grass with nitrogen (N) chemical fertilizer (100 kg N ha-'year-1), Bermuda grass oversown with forage pea (Pisum arvense cv. 'Iapar 83'), and Bermuda grass with the addition of 70 m³ ha-1 swine slurry. Three evaluation periods (cutting, baling and 30 days of storage) and five replicates were used. The DM yield of Bermuda grass without N was 2607 kg ha-1. The use of swine slurry increased the DM yield of Bermuda grass more than the use of the N chemical fertilizer (4864 and 3551 kg ha-1, respectively). In association with forage pea, a high total DM yield was obtained: 4261 kg ha-1 of pea and 2171 kg ha-1 of Bermuda grass. The dehydration time and final crude protein content of the Bermuda grass were higher in association with the legume. The levels of acid detergent-insoluble protein increased with storage. The in vitro DM digestibility reduced the cut to 30 days of storage in treatments with Bermuda grass without association with the legume. A higher occurrence of fungi occurred after 30 days of storage, with Penicillium generally predominant; however, Phoma was predominant in the hay produced from Bermuda grass grown with no N supplementation.

J.P. Ames, M.A. Neres, D.D. Castagnara, L.M. Mufatto, C. Ducati, C.C. Jobim y T.T. Tres. 2014. Producción de materia seca, composición química, digestibilidad de la materia seca y la aparición de hongos en heno de pasto Bermuda (Cynodon dactylon) bajo diferentes sistemas de fertilización o asociado con leguminosa anual de invierno. Cien. Inv. Agr. 41(2): 163-174. Este estudio tuvo como objetivo la evaluación de la curva de características estructurales, la deshidratación, la materia seca (MS), la composición química, digestibilidad in vitro de la MS y la aparición de hongos en heno de pasto Bermuda (Cynodon dactylon, cv. 'Tifton 85'), producido en invierno, bajo diferentes formas de fertilización o en asociación con una leguminosa anual de invierno. El diseño experimental utilizado fue de bloques al azar con parcelas divididas en el tiempo con cuatro tratamientos: Pasto Bermuda sin fertilización o consorcio, pasto Bermuda con fertilizante químico de nitrógeno (100 kg N ha- ¹ año -1), pasto Bermuda en asociación con el legume (Pisium avarse 'Iapar 83'), y pasto Bermuda con la adición de 70 m³ de purines ha-1 durante tres periodos de evaluación (de corte, de balas y 30 días de almacenamiento), con cinco repeticiones. El rendimiento de MS de pasto Bermuda sin nitrógeno fue 2.607 kg ha-1. El uso de purines porcinos aumentó el rendimiento de MS de pasto Bermuda más que el uso del nitrógeno fertilizante químico (4864 y 3551 kg ha-1, respectivamente). Su asociación con la leguminosa, de alto rendimiento de MS total, obtuvo: 4.261 kg ha-1 de guisantes y 2.171 kg ha-1 de pasto Bermuda. El tiempo de deshidratación y de proteína cruda total del heno de pasto Bermuda fueron más altos en asociación con leguminosas. Los niveles de la proteína insoluble en detergente ácido aumentaron con el almacenamiento y la digestibilidad de la MS in vitro, reduciendo el corte a los 30 días de almacenamiento en los tratamientos con pasto Bermuda y sin asociación con leguminosas. La mayor incidencia de los hongos se produjo después de 30 días de almacenamiento, con un predominio de Penicillium, excepto en el heno de pasto Bermuda, en ausencia de nitrógeno, donde el género predominante fue Phoma.

The objectives of this study were to estimate the curve of dehydration, bromatological composition and occurrence of fungi in Tifton 85 grass, submitted to four methods of dehydration. The curves of dehydration were studied in a completely randomized design with a 4 × 11 factorial scheme with four drying systems (1 conditioning + 1 turn-over; 2 conditionings + 1 turn-over; no conditioning + 1 turn-over and no conditioning + 2 turn-overs) and 11 sampling times (0, 3, 15, 18, 21, 24, 39, 42, 45 and 47 hours after the cutting), with six replicates. For the bromatological composition and fungi occurrence, the experimental design was completely randomized in a 4 × 3 factorial scheme with the four drying methods of Tifton 85 grass and three periods of evaluation (before the cutting, at the time of the baling and 30 days after storage) with six replicates. It was found that after the first hour after cutting and at the end of the period of dehydration, Tifton 85 plants that were treated with conditioners showed higher levels of dry matter. Stored hay that was treated with conditioners presented higher levels of acid detergent insoluble protein. Until baling, the drying methods did not alter the crude protein content of hay; however, after storage, the hay submitted only to turn-over showed crude protein content higher (13.90%) than those submitted to conditioners (9.94%). There was an increase in the occurrence of fungi after storage, but the application of conditioners and one turn-over resulted in lower CUF/g, compared with other treatments, enhancing the effect of conditioners on accelerating the dehydration rate and obtaining better hay storage conditions