The objective of this study was to evaluate the microbiological profile and aerobic stability of silage with Tifton 85 bermudagrass and different additives and wilting. The studied treatments were: pre-drying in the sun for two hours before ensiling; use of bacterial-enzymatic inoculant; addition of soybean peel; addition of corn grits and use of salt in the surface layer of the silo. The experimental design was completely randomized with six treatments and four replications. Plants of Tifton 85 bermudagrass with 38 days were ensiled in experimental silos with Bunsen valves, with compacting density of 236 kg silage per m³ for Tifton 85 bermudagrass, which was pre-dried in the sun; the average silage was 294 kg m-3 for the other treatments. The ratios between soybean hulls and corn grits, added to the silage, were calculated based on the initial DM content from Tifton 85 bermudagrass in order to obtain 320 g/kg DM of the material to be ensiled. There was an increase of lactic bacteria and Clostridium as well as an absence of enterobacteria after the silo opening. Fungi developed only in Tifton 85 bermudagrass and its treatments before the ensilage and yeasts developed in silages of Tifton 85 bermudagrass when they received soybean hulls or corn grits after silo opening. There was no breach regarding aerobic stability of silages during the studied period. The pH reached the highest values within 48 hours after opening the silos, but there were variations during this period.

Avaliou- se o efeito da adição de óxido de cálcio (0; 0,5; 1,0; 1,5 e 2,0%, da MS) na composição química e degradabilidade ruminal da matéria seca e fibra de detergente neutro (FDN), nas perdas de MS e na população microbiana em silagens de cana. Foi utilizado um delineamento com cinco níveis de óxido de cálcio e três repetições. Todas as variáveis foram influenciadas (P<0,05) pela adição de óxido de cálcio nas silagens, exceto a composição em proteína insolúvel em detergente ácido, carboidratos solúveis em água e lignina. O teor de matéria seca e o pH aumentaram linearmente, enquanto que os de matéria orgânica, hemicelulose e proteína bruta reduziram, também linearmente, com os níveis de óxido de cálcio. A fibra em detergente neutro corrigida para cinzas e proteína e a fibra em detergente ácido ajustaram- se a modelo quadrático, com valores mínimos calculados de 33,3 e 22,5% para os níveis de 1,73 e 1,49% óxido de cálcio, respectivamente. A digestibilidade in vitro da MS (DIVMS) e o conteúdo de nitrogênio amoniacal ajustaram- se a modelos quadráticos, com valores máximos de 80,1 e 9,1% para os níveis de 1,8 e 0,7% de óxido de cálcio, respectivamente. A produção mínima de gás (3,18%) foi observada no nível de 1,39% de óxido de cálcio. A produção de efluente e a recuperação de MS da massa ensilada apresentaram redução e aumento linear, respectivamente, com adição de óxido de cálcio. A maior população de bactérias ácido- lácticas foi observado na silagem tratada com 1,5% de óxido de cálcio. A adição de óxido de cálcio aumentou a degradabilidade da fração solúvel da MS, que foi superior a 50,0% e reduziu a fração indegradável da FDN. A adição de óxido de cálcio em níveis acima de 1,0% na cana- de- açúcar durante a ensilagem melhora a DIVMS e a recuperação da matéria seca, aumenta as populações de bactérias ácido- lácticas e reduz a produção de leveduras.

It was evaluated the addition of calcium oxide (0; 0.5; 1.0; 1.5; and 2.0% of dry matter) effect on the chemical composition and ruminal degradability of the dry matter and neutral detergent fiber, on the losses of dry matter, and on the microbial population in sugar cane silages. A design with five levels of calcium oxide and three replications was used. All the variables were influenced by the addition of calcium oxide in the silages, except the composition in acid detergent insoluble protein, water soluble carbohydrates and lignin. The dry matter content and pH linearly increased while the contents of organic matter, hemicellulose and crude protein linearly decreased with the levels of calcium oxide. Neutral detergent fiber corrected for ashes and protein and acid detergent fiber were adjusted for the quadratic models with calculated minimal values of 33.3 and 22.5% for the levels 1.73 and 1.49% of calcium oxide, respectively. The in vitro digestibility of the dry matter and the content of amoniacal nitrogen adjusted to quadratic models with maximal levels of 80.1% and 9.1% for the levels of 1.8 and 0.7% of calcium oxide, respectively. The minimal production of gas (3.18%) was observed at the level of 1.39% of calcium oxide. Production of effluent and recovery of dry matter of the ensiled mass showed a reduction and a linear increase, respectively, with addition of calcium oxide. The highest lactic acid bacterial population was observed in the silage treated with 1.5% of calcium oxide. The addition of calcium oxide increased degradability of the soluble fraction of the dry matter, which was higher than 50% and reduced the non- degradable fraction of the neutral detergent fiber. Addition of calcium oxide level higher than 1.0% in the sugar cane during ensilage improves in vitro dry matter digestibility and the recovery of dry matter, increases populations of lactic acid bacteria and reduces production of yeasts.