Effect of wilting, silage additive, PEG treatment and tannin content on the distribution of N between different fractions after ensiling of three different sainfoin (Onobrychis viciifolia) varieties

摘要: Sainfoin (Onobrychis viciifolia) is a tanniniferous, leguminous plant that has potentially beneficial effects on protein utilization in ruminants. Since ensiling causes breakdown and elevated levels of buffer soluble N (BSN), we studied the distribution before after sainfoin. Three varieties sainfoin were either direct-cut frozen directly or wilted later mini-silos with without acidification Promyr (PM; an acidifying commercial mixture propionic formic acid) polyethylene glycol (PEG). Extractable tannins (ET) bound (PBT) measured HCl/butanol method attempt to correlate tannin fractions. The silages showed good characteristics had relatively high concentrations un-degraded protein. effect wilting BSN (g/kg N) was dependent variety (P<0.001). PEG increased PM decreased level treatment also produced less non-protein ammonia-N (P<0.05) as compared no additive. Addition silage BSN-proportion 1.8- 2.6-fold for both DM stages. A strong tannin-protein binding is, therefore, confirmed However, correlations between (ET PBT) poor (non-PEG) silages, indicating unsuitable measuring qualitative attributes are more relevant than quantitative. seems therefore not be useful predict degradation silages.