Fat and fatty acids in preserved forages | Matière grasse et composition en acides gras des fourrages conservés
2010
Arrigo, Y., Forschungsanstalt Agroscope Liebefeld-Posieux ALP, Posieux (Switzerland)
This article shows the difference in fat and fatty acid levels between preserved forages and grass. Grass was harvested from the same plot of land at two different stages (30 days apart) over three years and stored using six different processes. 42 samples were analysed by extraction using petroleum ether for fat and by gas chromatography for fatty acids. There was considerable variation in the fat levels (11 to 40 g/kg dry matter (DM)): fodder cut early showing the highest levels (26 versus 20 g/kg DM p 0,01), and regrowth higher levels than the first cycle (26 versus 21 g/kg MS p 55 %. Fatty acid proportions are influenced by the stage of maturity and dry conservation methods reduce linolenic acid proportion. Grass harvested quickly as well as careful handling of the fodder maintain the fat and fatty acid levels.
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