Effect of compaction, delayed sealing and aerobic exposure on maize silage quality and on formation of volatile organic compounds
Effect of compaction, delayed sealing and aerobic exposure on maize silage quality and on formation of volatile organic compounds
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DOI：
10.1111/gfs.12288
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发表时间：
2018-03-01
影响因子：
2.4
通讯作者：
Suedekum, K. -H.
中科院分区：
文献类型：
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作者：
Bruening, D.;Gerlach, K.;Suedekum, K. -H.
压实、封口等物理和管理因素对牧草保鲜效果有很大影响。本研究旨在探讨青贮后压实、延迟封口和好氧暴露对玉米青贮品质和挥发性有机化合物形成的影响。用高密度或低密度压实全株玉米(277g/kg干物质)，灌浆后即刻封口或延迟封口(每个重复6个重复)。青贮至少175天后，每隔6天暴露于空气中，每隔2天取样。封口的延迟导致青贮前酵母菌数量的增加和水溶性碳水化合物的下降高达65%。4天后密封筒仓会造成高达11%的DM损失。延迟封口促进了开仓时乙酯的生成。密封延迟4天导致好氧稳定性最低。好氧暴露导致青贮料成分发生相当大的变化，饲料价值损失，最终导致变质。本研究表明，低压实度、延迟封口和好氧暴露对玉米青贮品质有不利影响。
Physical and management factors, such as compaction and sealing, greatly influence the outcome of forage conservation. This study aimed to determine the effects of compaction, delayed sealing and aerobic exposure after ensiling on maize silage quality and on formation of volatile organic compounds. Whole-crop maize (277g/kg dry matter [DM]) in 120-L plastic silos was compacted at either high or low density, and sealed immediately or with delay at 2days or 4days post-filling (six replicates each). After ensiling for at least 175days, the silages were exposed to air for 6-day intervals and sampled at 2-day intervals. A delay in sealing caused an increase in yeast counts and a decline of up to 65% in water-soluble carbohydrates before ensiling. Sealing the silos after 4days caused DM losses of up to 11%. Delayed sealing promoted the formation of ethyl esters at silo opening. A 4-day delay in sealing resulted in the lowest aerobic stability. Aerobic exposure led to considerable changes in silage composition, a loss in feed value and, finally, spoilage. This study indicates that maize silage quality is adversely affected by low compaction, delayed sealing and aerobic exposure.