绿洲区苜蓿与鸭茅混播饲草的青贮发酵品质研究

摘要

Forage from Medicago sativa/Dactylis glomerata pasture was used as raw material to make silage with 3 formulas(90% M.sativa + 10% D .glomerata ,70% + M.sativa + 30% D .glomerata and 50% M.sa-tiva + 50% D .glomerata)and the fermentation quality was tested.The results showed that the smell,texture, color and sensory of the mixed silage were excellent,and the pH value showed a decreasing trend.The quality was better than the single silage separately made with M.sativa and D .glomerata .The ammonia nitrogen con-tent of mixed silage reduced by 36.4% compared to single silage of M.sativa ,the acetic acid and propionic acid contents of D .glomerata silage obviously decreased.The mixed silage improved the lactic acid content and effec-tively inhibited the production of butyric acid.The butyric acid was not detected in treatments of M.sativa +D .glomerata(7∶3 and 5∶5 of mixing ratio).The crude protein content and detergent fiber of 3 mixed silage treatments were 31.9% higher and 12.6% lower than that of D .glomerata silage respectively.Therefore,the treatment of M.sativa + D .glomerata by 7∶3 ratio was the best.%以苜蓿(Medicago sativa )与鸭茅(Dactylis glomerata )混播草地牧草为材料，按照90%苜蓿+10%鸭茅、70%苜蓿+30%鸭茅、50%苜蓿+50%鸭茅的比例进行青贮，通过分析对比发酵品质、营养成分、感官青贮效果等，以期优化最佳混合青贮的豆∶禾比例。试验结果表明：苜蓿和鸭茅混合青贮后，气味、质地、色泽感官评定均为优良，且 pH 呈下降趋势，青贮效果优于苜蓿和鸭茅的单独青贮。混合青贮降低了苜蓿青贮中氨态氮含量的36.4%，鸭茅青贮中乙酸、丙酸的含量明显下降；提高了苜蓿青贮中乳酸的含量，有效抑制了丁酸的产生，苜蓿+鸭茅饲草混贮比例为7∶3和5∶5处理结果未检测出丁酸。3个混合青贮组合的粗蛋白含量高出鸭茅单贮31.9%，酸性洗涤纤维低于鸭茅青贮12.6%。在青贮发酵过程中，苜蓿+鸭茅以7∶3比例混合青贮，有利于提高青贮饲料的发酵品质。