Marco Antonio da Rocha

Cinética ruminal da degradação de nutrientes da silagem de milho em ambiente ruminal inoculado com diferentes aditivos

Four bulls fitted with ruminal cannula were used in a 4 x 4 Latin square design to evaluate the effects of different ruminally inoculated additives on the degradation kinetics of DM, CP, and NDF of corn silage (CS). The treatments were: control CS incubated in rumen with no additive; LB - CS incubated in rumen inoculated with five grams of dehydrated and lyophilized ruminal and intestinal bacteria (Ruminobacter amylophilum: 3.0 x 1011 ufc/kg; Fibrobacter succinogenes: 3.0 x 1011 ufc/kg; Succinovibrio dextrinsolvens: 4.4 x 1011 ufc/kg; Bacillus cereus: 3.5 x 1011 ufc/kg; Lactobacillus acidophilus: 3.5 x 1011 ufc/kg and Streptococcus faecium: 3.5 x 1011 ufc/kg); CE - CS incubated in rumen inoculated with 15 grams of cellulolytic enzymes (xylanase; 10%); and SM - CS incubated in rumen inoculated with three milligrams of sodium monensin. The LB and CE treatments did not affect the potentially degradable b fraction of CS nutrients. However, the SM treatment reduced the DM b fraction (51.01%) and the potential degradability of CS (72.33%). Use of SM resulted in the greatest NDF indigestible fraction reducing NDF disappearance after 48 hours of ruminal incubation. It can be concluded that the different additives did not improve the effective degradability of CS DM, CP, and NDF.