Perennial results of forage quality of the austrian silage project | Mehrjaehrige Ergebnisse von Futterqualitaeten aus dem Oesterreichischen Silageprojekt
2008
Resch, R., LFZ Raumberg-Gumpenstein (Austria). Institut Pflanzenbau und Kulturlandschaft.
A nationwide Austrian silage project was carried out in the years of 2003, 2005 und 2007 under cooperation of farmers, feeding consulters, the chemical laboratory of Rosenau and the LFZ Raumberg-Gumpenstein. Goal of this project was the creation of an actual database of different grass silage samples to declare multivariate relationships between quality parameters and silage management. Ensiling of grass at a crude fibre level above 270 g/kg DM (41 % of 2,413 silage samples) caused a noticeable reduction of energy (MJ NEL/kg DM) and simultaneously a high significant increase of butyric acid content (g/kg DM) and decrease of density level (kg DM/m ). Only a few numbers of prewilted silage samples (above 40 % DM) achieved the recommended density level of 225-250 kg DM/m . Deep cut (less 5 cm) was leading to significant higher ash contents. Increase of 1 % ash in DM caused a Netto Energy-Lactation (NEL) decrease of 0.1 MJ/kg DM. A great number of Austrian grass silage producers have a consulting deficit in selection of right harvest time, optimum of dry matter content and earthy contamination. Noncompliance of the recommended silage rules increases the risk of quality loss by suboptimal silage fermentation in a cumulative way.
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