杂交狼尾草与不同牧草混合青贮效果研究

Study on mixed silage effect of hybrid Pennisetum and different forage

试验旨在研究杂交狼尾草(hybrid Pennisetum)与不同牧草进行不同比例混合青贮的适宜组配方法。试验选取拉巴豆(Lablab purpureus)、籽粒苋(Amaranthus hypochondriacus)、甜高粱(Sorghum bicolor)为混合对象,按原料鲜重计,混合比例分别为80∶20、70∶30、60∶40。青贮45 d,对青贮料进行感官评价、营养成分分析、青贮发酵品质分析和kaiser评分。结果显示,杂交狼尾草与拉巴豆按80∶20和70∶30比例混合能够显著提高青贮料的粗蛋白(CP)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、水溶性碳水化合物(WSC)含量和相对饲喂价值(RFV)(P<0.05)。杂交狼尾草与甜高粱按70∶30比例混合能够显著降低乙酸和丁酸含量(P<0.05),提高青贮料发酵品质。杂交狼尾草与籽粒苋混合青贮组的pH值和乙酸含量升高,未能提升青贮料发酵品质。研究表明,杂交狼尾草与拉巴豆的适宜混合青贮比例为80∶20和70∶30,杂交狼尾草与甜高粱的适宜混合青贮比例为70∶30。

The aim of the experiment was to study the suitable mixing method of hybrid Pennisetum and different forage in different proportions.Lablab purpureus,Amaranthus hypochondriacus and Sorghum bicolor were selected as mixed objects,and the mixing ratios were 80∶20,70∶30 and 60∶40,respectively,according to the fresh weight of raw materials.After 45 d of silage,sensory evaluation,nutrient composition analysis,fermentation quality analysis and kaiser score were performed.The results showed that mixing hybrid Pennisetum and Lablab purpureus at the ratio of 80∶20 and 70∶30 could significantly increased the content of CP,NDF,ADF,WSC and RFV of silage(P<0.05).Mixing hybrid Pennisetum with Sorghum bicolor at the ratio of 70∶30 could significantly decreasedthe content of acetic acid and butyric acid and improve the fermentation quality of silage(P<0.05).The pH value and acetic acid content of mixed silage of hybrid Pennisetum and Amaranthus hypochondriacus were increased which could not improve the fermentation quality of silage.The study indicates that the optimum mixing ensilage ratio of hybrid Pennisetum and Lablab purpureus is 80∶20 and 70∶30,and the optimum mixing ensilage ratio of hybrid Pennisetum with Sorghum bicolor is 70∶30.