北方混播人工草地放牧羊采食量预测及消化率研究

Prediction of Forage Intake and Study Digestibility of Grazing Sheep on Mixed Artificial Grassland in North China

在我国北方豆科+禾本科牧草混播人工草地,采取连续放牧(CG)、划区轮牧(RG)两种管理方式放牧苏尼特羊,用内源指示剂法研究放牧羊采食量、牧草干物质消化率,通过放牧羊体重、代谢体重预测牧草采食量。结果表明,划区轮牧羊只采食量显著高于连续放牧(P<0.05),其牧草干物质消化率与连续放牧差异不显著;由放牧羊体重(W)预测人工草地牧草日干物质采食量(DMI)时具有较高可信度,1岁龄、2岁龄、3岁龄羊预测模型分别为DMI=17.32W+60.15、DMI=35.82W-881.92、DMI=64.61W-2427.50。

In northern China,Sunit sheep were used as grazing animals on an artificial grassland consisting of a mixture of legumes and gramineous forage.Two management methods,continuous grazing(CG)and regional rotational grazing(RG),were adopted.The grazing sheep forage intake and the forage dry matter(DM)digestibility were measured using endogenous indicator.In addition,a regression model was established to pre⁃dict forage intake based on the live weight and metabolic weight of grazing sheep.The results showed that the forage intake of RG sheep was significantly higher than those of CG sheep(P<0.05),and there was no signifi⁃cant difference between dry matter digestibility with CG sheep.High reliability models were developed to pre⁃dict the daily DM intake(DMI)in artificial grassland based on the live weight of grazing sheep(W),and the models were DMI=17.32W+60.15,DMI=35.82W-881.92,DMI=64.61W-2427.50 at 1,2,and 3 years of age,respectively.