Mechanisms of adaptation in sheep to overcome silage intake depression induced by biogenic amines

摘要: Effects of biogenic amines on silage intake and rumen fermentation during dietary changes were studied in sheep. Two direct-cut grass silages prepared from a single sward, one untreated (WAS) treated with 4.0 litres formic acid (850 ml/l) per tonne (FAS). Diets FAS, FAS supplemented 7.2 g amines/kg DM (FAS + A), offered ad libitum, once daily to four rumen-cannulated, intact wethers repeated crossover design experiment During pre-period before each crossover, the animals either low (FAS), or that containing moderate concentrations (WAS). first 4 d A treatment, added tended lower (DMI) lowered significantly DMI principal meal after feeding. This acute effect be reduced when sheep previously preconditioned by feeding WAS, depression was reduced. At end 14 FAS+A period similar hut pattern remained different, 5 feeding, this being compensated for day. Rumen less offered, due not amines. However, unadapted A, amine content higher than adapted WAS. Adaptation WAS pre-periods, increased amine-degrading capacity fluid. In conclusion, amines, will acutely through palatibility most probably stressing intermediary metabolism. Being slightly reduces DMI. Although within diet DMI, there clear evidence have negative palatability.