黄土高原模拟轮牧对高糖黑麦草生产性能的影响

Responses of high-sugar ryegrass productive performance to stimulated grazing on the Loess Plateau

在黄土高原引种3种高糖黑麦草(Lolium perenne),采用模拟轮牧(SG)和全株收获干草(MH)两种利用方式,评价饲草生产性能。SG的3种高糖黑麦草品种的粗蛋白含量、粗脂肪含量和粗灰分的含量明显高于MH,SG的粗纤维含量和可溶性糖含量显著低于MH(P<0.05)。SG显著增加粗蛋白、粗脂肪、粗灰分和水分利用效率(P<0.05),提高‘明星’和‘优质’的总能产量。高糖黑麦草品种"明星"的产草量、水分利用效率和各种养分的产量极显著高于其他2个高糖黑麦草品种‘神奇’和‘阿旺’(P<0.01),其他高糖黑麦草品种与对照品种差异不显著(P>0.05)。SG提高高糖黑麦草的饲用价值,且‘明星’的饲用价值高于其他品种。

In the present study, the productive performance of 3 different introduced high-sugar ryegrass cultivars were quantitatively analyzed in both simulated grazing conditions and making hay conditions in Loess Plateau. The results showed that the contents of crude proteins, crude fats and crude Ash of 3 culti- vars in simulated grazing conditions were significantly higher than those in making hay conditions, while the content of crude fibers and water soluble carbohydrates in simulated grazing conditions were significantly lower than those in making hay areas （P〈0.05） which suggested that simulated grazing can signifi- cantly improved （P〈0.05） the contents of crude proteins, crude fats, crude Ash and water use efficiency. The simulated grazing significantly increased （P 〈 0.05） the yield of gross energy of ryegrass cultivar ＂Star＂ and ＂Premium＂ . The hay yield, water use efficiency and nutrient contents of cultivar ＂Star＂ in sim- ulated grazing conditions were significantly higher （P〈0.01） than those of the other 2 high-sugar cultivars ‘Abermagic＇ and ‘Aberavon＇ which had no significant difference between each other. In conclusion, simu- lated grazing improved the productive performance of high-sugar ryegrass cultivars and the performance of ＂Star＂ had higher and stable performance.