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（ABSTRACT） 本研究旨在评估象草（Pennisetum purpureum, PP）与百香果果皮（passion-fruit-peel, PFP）青贮饲料的感官特性、总损耗量、发酵特性及化学成分。本试验设置4个象草脱水时长梯度（0、4、6及8小时），并设置5种原料配比组合开展评价：100%象草组、100%百香果果皮组、75%象草/25%百香果果皮组、50%象草/50%百香果果皮组、25%象草/75%百香果果皮组。含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，并散发出百香果香气。含百香果果皮的青贮饲料总损耗量随果皮占比提升而升高：100%象草组、75%象草/25%百香果果皮组、50%象草/50%百香果果皮组、25%象草/75%百香果果皮组及100%百香果果皮组的损耗量分别为0.09、0.15、1.01、1.77及2.52kg。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区间内。添加百香果果皮的混合原料组可降低青贮饲料的干物质（DM）与中性洗涤纤维（NDF）含量，同时提升粗蛋白（CP）、非纤维碳水化合物（NFC）、酸性洗涤不溶性氮（ADIN）及中性洗涤不溶性氮（NDIN）水平。尽管干物质含量有所降低，但所有处理组均获得了品质优良的青贮饲料。