Effects of silage additive, time of flow following ensiling, and storage conditions on the quality of silage effluent intended for animal feeding
1996
Randby, Aa. T. (Norges Landbrukshoegskole, Aas (Norway). Inst. for Husdyrfag) | Skaar, I.
Three experiments were conducted to investigate methods of storage for silage effluent intended for animal feeding. Fifty-two different types of effluent, derived from silages treated with various silage additives and collected at increasing lengths of time following ensiling, were assessed. The effects of surface sealing of the effluent and application of preservatives during storage were studied. Surface fungi were identified. The quality of most effluents deteriorated seriously over time when stored with neither sealing treatment nor preservative. The use of surface layers of liquid paraffin or waste deep-fat as sealing treatments, as well as lids, reduced surface moulding and storage losses, and dramatically improved the fermentation quality of stored effluent. Preservation of effluent with formic acid increased the sugar content in stored effluent by restricting the fermentation of sugar to acetic, propionic, and butyric acids, and ethanol. As compared to effluent draining from silage at later stages, effluent draining over the first days following ensiling was of superior quality, but more susceptible to deterioration if not properly stored. When preserved with levels of formic acid sufficient to restrict ethanol fermentation, effluents from silages treated with formic acid based additives were of better fermentation quality than effluents from silages treated with other additives. The mixing of preservatives into the surface layer of paraffin improved the quality of long-term stored effluent.
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