Characteristics of Pennisetum purpureum and passion-fruit-peel silages

ABSTRACT This study aimed at evaluating sensorial characteristics, total waste, fermentative profile, and chemical composition of Pennisetum purpureum (PP) and passion-fruit-peel (PFP) silages. Four PP dehydration times (0,4,6 and 8 hours) and five combinations of ingredients (100% PP; 100% PFP; 75% PP/25% PFP; 50% PP/50% PFP; 25% PP/75% PFP) were evaluated. The silages presented a yellowish color, a slightly acrid odor, and exhaled passion fruit scent in the treatments containing PFP. There was an increase in total waste of silages containing passion fruit peel (0.09, 0.15, 1.01, 1.77 and 2.52kg of waste for treatments 100% PP, 75% PP/25% PFP, 50% PP/50% PFP, 25% CE/75% CM and 100% CM, respectively). The pH and N-NH3 values ranged from 3.58 to 4.63 and 8.11 to 12.13, respectively. Mixtures containing PFP decreased the levels of DM and NDF and increased the levels of CP, NFC, ADIN and NDIN in the silages. Despite the reduced levels of DM, all treatments provided a good silage.

摘要 本研究旨在评价象草（Pennisetum purpureum, PP）与百香果果皮（passion-fruit-peel, PFP）青贮饲料的感官特性、总损耗、发酵特性与化学成分。试验设置4个象草脱水时长梯度（0、4、6和8小时），以及5种原料配比组合：100% PP、100% PFP、75% PP/25% PFP、50% PP/50% PFP、25% PP/75% PFP，开展相关评价。
结果表明，添加百香果果皮的处理组青贮饲料呈淡黄色，带有轻微刺鼻气味，并释放出百香果特有香气。添加百香果果皮的青贮饲料总损耗随果皮占比提升而升高，各处理组对应损耗量分别为：100% PP组0.09kg、75% PP/25% PFP组0.15kg、50% PP/50% PFP组1.01kg、25% PP/75% PFP组1.77kg、100% PFP组2.52kg（原文此处存在笔误，原表述为25% CE/75% CM与100% CM，已根据前文配比逻辑修正）。青贮饲料的pH值与氨态氮（N-NH3）含量分别介于3.58~4.63与8.11~12.13之间。添加PFP的混合配比可降低青贮饲料的干物质（Dry Matter, DM）与中性洗涤纤维（Neutral Detergent Fiber, NDF）含量，同时提升粗蛋白（Crude Protein, CP）、非纤维碳水化合物（Non-Fiber Carbohydrate, NFC）、酸性洗涤不溶性氮（Acid Detergent Insoluble Nitrogen, ADIN）与中性洗涤不溶性氮（Neutral Detergent Insoluble Nitrogen, NDIN）水平。尽管干物质含量有所降低，但所有处理组均制备得到品质优良的青贮饲料。