Use of fish waste and pineapple peel to produce biological silage

Six treatments were formulated to make silages with fish wastes, corn stubble, molasses, pineapple peel (PP) [15, 30 and 45%] and inoculum Lactobacillus sp. or Lactobacillus B2. The silages of each treatment were made in triplicate and incubated at 30 degrees C for 0, 2, 4, 7 and 14 days in order to evaluate the acidification under a 3 x 2 x 5 factorial design. The chemical composition and in vitro dry matter digestibility (IVDMD) were determined to the silages at end of fermentation. The highest acidification (p<0.05) was presented in the treatments with PP 15 and 30% and Lactobacillus B2 for 7 days. The highest dry matter content (39.3%) (p<0.05) was obtained with 15% of PP and the crude protein was from 26.5 to 31% without significant difference. The highest concentration of lipids (9.85%) was present in the treatments with PP 30 and 45% and Lactobacillus B2. Detergent fiber fractions decreased with increasing PP level and the highest IVDMD (82.9%) occurred in silages when using Lactobacillus B2, regardless of PP level. The silages obtained are an alternative in ruminant feeding.