Abstract This study was to evaluate the effects of malate, citrate, succinate and fumarate on the fermentation quality, proteolysis and lipolysis and aerobic stability of alfalfa silage ensiled at two different dry matter (DM) contents. Alfalfa was harvested in the late bud to the early flower stage and wilted to DM contents of approximately 330 (normal DM) and 400 (high DM) g/kg fresh weight. The wilted and chopped alfalfa was ensiled in vacuum-sealing polyethylene plastic bags with treatments of control (distilled water), 0.5 % dl -malic acid (MA), 0.5 % citric acid (CA), 0.5 % sodium succinate (SS) and 0.5 % sodium fumarate (SF). All the application rates were based on the fresh weight of forage. After 60 days of ensiling, alfalfa silages ensiled at a normal DM had greater concentrations of lactic acid, acetic acid, non-protein N (NPN), ammonia N (NH3-N), greater aerobic stability and lower concentration of water soluble carbohydrates (WSC), DM loss when compared to the silages ensiled at a high DM (P

中文翻译：

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苹果酸、柠檬酸、琥珀酸和富马酸对苜蓿青贮发酵、化学成分、需氧稳定性和消化率的影响

摘要 本研究旨在评价苹果酸、柠檬酸、琥珀酸和富马酸对两种不同干物质（DM）含量青贮苜蓿青贮发酵品质、蛋白水解和脂肪分解及需氧稳定性的影响。紫花苜蓿在晚芽到早花阶段收获，枯萎至干物质含量约为 330（正常干物质）和 400（高干物质）g/kg 鲜重。将枯萎和切碎的苜蓿青贮在真空密封的聚乙烯塑料袋中，并进行对照处理（蒸馏水）、0.5% dl-苹果酸 (MA)、0.5% 柠檬酸 (CA)、0.5% 琥珀酸钠 (SS) 和 0.5 % 富马酸钠 (SF)。所有施用量均以牧草鲜重为基础。青贮 60 天后，在正常 DM 条件下青贮的苜蓿青贮具有更高浓度的乳酸、乙酸、非蛋白 N (NPN)、