晾晒与添加剂对反枝苋青贮饲料品质的影响

Effects of Moisture and Additives on Amaranthus retroflexus Silage

为探究含水量及添加剂(甲酸和蔗糖)对反枝苋(Amaranthus retroflexus)青贮饲料品质的影响,以开花期的反枝苋为原料,在鲜贮和晾晒2种条件下分别设置甲酸(6mL.kg-1)和蔗糖(2%)处理,以不使用任何添加剂为对照,袋装青贮360d。结果表明:晾晒处理与鲜贮的反枝苋青贮饲料pH值和乳酸含量均无显著差异,而乙酸含量极显著增加(P<0.01),氨态氮含量显著降低(P<0.05),通过青贮硝酸盐含量显著降低,青贮饲料品质无显著差异。添加甲酸和蔗糖能够改善反枝苋青贮饲料的发酵品质,极显著降低反枝苋青贮饲料的pH值和氨态氮含量并提高乳酸生成量(P<0.01)。

The effects of moisture and formic acid or sucrose on Amaranthus retroflexus silage were studied.Fresh or wilted A.retroflexus at flowering stages were packed and ensilaged for 360 d with sucrose(2%) or formic acid(6 mL·kg-1).Results showed that the pH and lactic acid content of wilted A.retroflexus silage were similar to that of fresh A.retroflexus silage,whereas acetic acid content was increased(P<0.01) and ammonia nitrogen content was reduced(P<0.05).Nitrate content was reduced significantly by ensiling.The quality of Amaranthus retroflexus silage was not improved significantly compared to control.The silage fermentation quality was improved by formic acid or sucrose which reduced the pH and ammonia nitrogen content significantly(P<0.01) and increased lactic acid content(P<0.01).