The objective of this study was to evaluate the sugarcane silage in relation to chemical composition, pH, total losses, aerobic stability, in vitro digestibility of dry matter (IVDDM) and effective degradability (ED) of bovine and buffaloes under the following treatments (on a dry matter (DM) basis): sugarcane silage control (control), with addition of 3.3% urea; with addition of Lactobacillus buchneri (inoculate); with inoculate + 3.3% urea; with inoculate + 25.0% soybean hull, and with inoculate + 25.0% cassava byproduct meal. The experiment was analyzed through a completely randomized design with three replications, and for DM ED, a double 4 × 4 Latin square with a 4 × 2 factorial arrangement was used. The sugarcane variety was the RB-855156 (precocious). The urea increased the protein level and reduced neutral and acid detergent fiber and lignin fractions. Treatments with inoculate + cassava byproduct and inoculate + soybean hull increased DM levels. Bovines presented higher IVDDM than buffaloes. pH values varied from 3.1 to 4.0. Mean total losses observed were 7.8%. Treatments with inoculate + cassava and inoculate + soybean hulls resulted in larger aerobic stability with 61 and 81 hours, respectively, in relation to silages control (24 h) and control with 3.3% urea (33 h). A higher DM ED was verified for silages with inoculate + control and inoculate + soybean hulls at 2%/h passage rates and higher neutral detergent fiber ED for the treatment of control + inoculate + soybean hulls at 2 and 5%/h. Silages treated with urea, L. buchneri or agricultural byproduct plus inoculate presented better quality pattern.

Avaliaram-se os coeficientes de digestibilidade (CD) parcial e total dos nutrientes, o pH, a concentração de nitrogênio amoniacal (N-NH3) do líquido ruminal e a eficiência de síntese microbiana em bovinos alimentados com rações contendo 0; 8; 16 e 24% de resíduo de cervejaria fermentado (RCF). O resíduo de cervejaria foi conservado em silo de superfície (5.000 kg). Foram utilizados quatro bovinos da raça Holandesa com peso corporal de 480 ± 100 kg, portadores de cânula ruminal e duodenal, distribuídos em delineamento quadrado latino 4 × 4. O consumo médio de MS pelos animais foi de 1,7% do peso corporal (PC). Os coeficientes de digestibilidades total e ruminal dos nutrientes não diferiram entre os níveis de RCF utilizados nas rações. Os níveis de RCF nas rações tiveram efeito linear crescente sobre o coeficiente de digestibilidade intestinal de matéria seca e carboidratos totais, calculado em porcentagem do que chegou ao compartimento. Não houve efeito dos níveis de RCF nas rações sobre o pH e a concentração de N-NH3 do líquido ruminal. Os níveis de RCF nas rações não influenciaram a eficiência de síntese microbiana em g N-Mic/kg de matéria orgânica aparentemente degradável no rúmen (MOADR) e da matéria orgânica verdadeiramente degradável no rúmen (MOVDR). A inclusão de até 24% do RCF na MS em rações para bovinos não altera os processos de fermentação ruminal e digestão dos nutrientes.

The objective of the present study was to evaluate the partial and total digestibility coefficient (DC) of the nutrients, ruminal pH, ammonia nitrogen (N-NH3) concentration in the ruminal fluid and microbial efficiency synthesis in bovines fed rations containing 0, 8, 16 and 24% of brewers grains. The brewer grains were ensiled in surface silo (5,000 kg). Four Holstein cattle (480 ± 100 kg of body weight) fitted with ruminal and duodenal cannulas, were distributed to 4 × 4 Latin square design. The mean DM intake of animals was 1.7% BW. Total and ruminal DC of the nutrients did not differ among the levels of BG used in the rations. The levels of BG in the rations showed a linearly increased on the intestinal DC dry matter and TC, as % of that reached the compartment. There was no effect of levels of BG in rations on pH and N-NH3 concentration in the ruminal fluid. The levels of RCF in diets did not affect the microbial efficiency synthesis in g N-Mic/kg of rumen apparent degradable organic matter and rumen truly degradable organic matter. The inclusion of up to 24% of BG (%DM) cattle feed does not alter the processes of rumen fermentation and digestion of nutrients.