Aditivos na ensilagem de capim-Massai (Megathyrsus maximus x M. infestum cv. Massai)

• Ano de defesa: 2019
• Autor(a) principal: Anjos, Amanda Nunes Assis dos
• Orientador(a): Almeida, Jo?o Carlos de Carvalho
• Banca de defesa: Almeida, Jo?o Carlos de Carvalho, Carvalho, Carlos Augusto Brand?o de, Melo, Ana L?cia Puerro de, P?dua, F?bio Teixeira de, Longo, Cibele
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural do Rio de Janeiro
• Programa de Pós-Graduação: Programa de P?s-Gradua??o em Zootecnia
• Departamento: Instituto de Zootecnia
• País: Brasil
• Palavras-chave em Português: Pola c?trica; Inoculante bacteriano; Megathyrsus maximus x M. infestum cv. Massai; Valor nutritivo
• Palavras-chave em Inglês: Citric pulp; Bacterial inoculant; Megathyrsus maximus x M. infestum cv. Massai; Nutritive value.
• Área do conhecimento CNPq: Zootecnia
• Link de acesso: https://tede.ufrrj.br/jspui/handle/jspui/5332

Conservation of excess fodder produced in the rainy season is a viable alternative to address the shortage of bulky food in the dry season. However, the low dry matter content, the low proportion of soluble carbohydrates and the high buffer capacity at the ideal cutting stage for silage impairs the fermentative activity, resulting in low quality silage. Thus, the use of technologies that aim to minimize the effects of these variables on the fermentative profile of silage is an alternative for the use of high productive capacity forages. Therefore, the general objective of this study was to evaluate the benefits obtained through the inclusion of pelletized citrus pulp associated or not to microbial inoculant in Massai grass silage, aiming to contribute to the knowledge of tropical grass silage processes, as well as the maintenance of conservation conditions of the said silages. A completely randomized design in a 2 X 4 factorial scheme (presence or absence of microbial inoculant x 10, 20 and 30% of pelletized citrus pulp) with five replications/treatment was used. The material was stored in PVC silos for 90 days. After this period, weighings were again performed to determine RMS and losses. After opening the silos, samples were collected for further analysis of ammonia nitrogen, pH and chemical composition. The addition of pelleted citrus pulp caused an increase in DM content of 28.45%, reduced gas losses and no effluent production, as well as high DM recovery rates. An interaction effect between microbial inoculant and citrus pulp was observed for EE and EB contents. Ammonia pH and N values remained within the range considered ideal for quality silage. Decreasing linear effect of the addition of citrus pulp on ADF (from 43.92 to 37.95%), NDF (from 74.45 to 59.65%), CEL (from 33.28 to 28.02) was observed. %) and HEMI (from 30.53 to 21.39%), but with a slight increase in IIG levels (5.28 to 6.31%). Contrary behavior was observed for CT contents, which showed increases of 0.05 percentage units for each 1% of added citrus pulp. For the CP contents the citrus pulp provided increases of 0.02 percentage units for each 1% inclusion of this additive, ranging from 4.85 to 5.69%. Regarding the NDIP contents, interaction effect was observed, with quadratic behavior for the presence and absence of microbial inoculant and minimum points equal to 15.88% and maximum 31.31% of citrus pulp, respectively. For ADIP values the inclusion of pelletized citrus pulp caused an increasing linear effect with increases of 0.13 percentage units for each 1% inclusion of this additive in Massai grass silage, ranging from 10.83 to 15.11%. There was no effect of the presence or absence of microbial inoculant or interaction between factors on protein and energy fractions. The energy fractions (A + B1, B2 and C) and nitrogen fractions B1 + B2 and C were influenced by the levels of citrus pulp inclusion, which was not observed in the other fractions A and B3 of the silages. The fractions A + B1 and C increased as a function of the inclusion levels of the citrus pulp, while the fraction B2 levels were reduced. It was also observed increase of the indigestible protein fraction (C). The energy fractions ranged from 32.12 to 42.97%; 54.93 to 41.31% and 12.95 to 15.72% for A + B1, B2 and C, respectively. While protein fractions ranged from 29.81 to 22.13% and 10.83 to 15.11% for B1 + B2 and C. Inclusions of 10 to 20% inclusion of pelletized citrus pulp based on natural matter Massai grass are sufficient to improve the fermentative parameters and carbohydrate and protein profiles of silages.