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首页> 外文期刊>Irish Journal of Agricultural and Food Research >Conservation characteristics of baled grass silages differing in duration of wilting, bale density and number of layers of plastic stretch-film
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Conservation characteristics of baled grass silages differing in duration of wilting, bale density and number of layers of plastic stretch-film

机译：捆包青贮饲料的萎characteristics持续时间，捆密度和塑料拉伸膜层数不同，其保存特性也不同

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摘要

The effects of duration of wilting, bale density and number of layers of plastic stretch-film used to wrap bales on the conservation characteristics of baled grass silage was investigated. Grass from the primary growth of a Lolium perenne dominant sward was wilted for 24,48 or 72 h. For each duration of wilting, 54 cylindrical bales (1.2 m nominal diameter) were made with the baler at a high or low density setting for alternate bales. Bales were wrapped with 2, 4 or 6 layers of plastic stretch-film and stored outdoors for 295 days. Two layers of plastic stretch-film resulted in inferior preservation, lower digestibility and extensive mould growth and deteriorated silage. Substantial improvement occurred to each of these characteristics from applying four layers of stretch-film (P<0.05), while six layers of stretch-film brought little further improvement. When four or six layers of stretch-film were used, extensive wilting restricted fermentation and improved the standard of preservation with the apparently difficult-to-preserve herbage used in this experiment. However, under the anaerobic conditions provided by four or six layers of stretch-film neither progressive wilting nor bale density had a major effect on digestibility, or the extent of surface mould growth or deteriorated silage. It can be concluded that a minimum of four layers of conventional black plastic stretch-film were required to achieve suitably anaerobic conditions, and that the additional benefits from six layers were small. Once anaerobic conditions were achieved, extensive wilting improved the conservation characteristics of baled grass silage made from a difficult-to-preserve crop, whereas bale density had little impact.
机译：研究了萎wil的持续时间，草捆密度和包裹草捆的塑料拉伸膜层数对打包草青贮饲料保存特性的影响。多年生黑麦草优势草初生的草枯萎了24,48或72 h。对于每个萎of持续时间，用打包机将高密度或低密度打包机制成54个圆柱形的打包机（标称直径为1.2 m）以替代打包机。捆包有2、4或6层塑料拉伸膜，并在户外存放295天。两层塑料拉伸膜导致保存性能较差，消化率较低，霉菌大量生长和青贮饲料变差。通过应用四层拉伸膜（P <0.05），这些特性中的每一个都有了显着改善，而六层拉伸膜带来的进一步改善几乎没有。当使用四层或六层拉伸膜时，大量萎限制了发酵并提高了本实验中使用的似乎难以保存的草的保存标准。但是，在由四层或六层拉伸膜提供的厌氧条件下，渐进式萎ba和草捆密度均不会对消化率或表面霉菌生长或青贮饲料的劣化产生重大影响。可以得出结论，至少需要四层常规的黑色塑料拉伸膜才能达到合适的厌氧条件，而六层的额外收益很小。一旦达到厌氧条件，广泛的萎改善了由难以保存的作物制成的打包草青贮饲料的保存特性，而草捆密度影响不大。

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