This experiment was conducted to investigate the requirements of energy and protein of Shanbei white cashmere wether goats so as to provide data for establishing them.Thirty-six healthy one-year-old Shan-bei white cashmere wether goats with similar body weight were randomly divided into 9 groups according to a 3×3 ( energy×protein) completely random experiment design, and each group had 4 replicates with 1 goat per replicate.digestible energy (DE) level in diet was formulated at 100%, 110%and 120%of NRC (1981) rec-ommendation, respectively; and crude protein ( CP) level was formulated at 90%, 110%and 130%of NRC (1981) recommendation, respectively.The pretest lasted for 7 days, and the test lasted for 46 days.The re-sults showed as follows:1) energy level in diet had extremely significant effects on dry matter intake ( DMI) and average daily gain ( ADG) ( P<0.01) , and protein level significantly affected DMI ( P<0.05);there was significant interaction on DMI between energy and protein levels in diet ( P<0.05).2) Digestible nitrogen ( N) in low energy group was significantly lower than that in medium and high energy groups ( P<0.05); N intake, digestible N, retained N, N apparent digestibility in low protein group were extremely lower than those of medium and high protein groups ( P<0.01) .3) Gross energy ( GE) digestibility and metabolic rate were extremely significantly increased with energy level improving ( P<0.01 ); metabolic rates of GE and DE in high protein group were significantly lower than these in low protein group ( P<0.05); There was significant interactions of energy×protein on GE digestibility, GE metabolic rate and DE metabolic rate ( P<0.05 or P<0.01) .We establish regression equations of energy and protein requirement of one-year-old Shanbei white cashmere wether goats, the proper range of DE and ME levels in diet are 8.80 to 10.61 MJ/kg and 7.34 to 8.76 MJ/kg, respectively, and the appropriate CP and digestible CP levels are 10.00%and 7.34%, respec-tively.%本试验旨在研究陕北白绒山羊羯羊能量和蛋白质的需要量，为制定其饲养标准提供数据。选取36只体重相近、健康状况良好的陕北白绒山羊周岁羯羊，按3×3（能量×蛋白质）完全随机设计分为9组，每组4个重复，每个重复1只。各组饲粮消化能和粗蛋白质水平分别参照NRC（1981）推荐量的100％、110％、120％和90％、110％、130％设定。预试期7 d，正试期46 d。结果表明：1）饲粮能量水平对周岁羯羊的干物质采食量和平均日增重都有极显著影响（ P＜0．01），蛋白质水平对干物质采食量影响显著（ P＜0．05）；饲粮能量和蛋白质水平对干物质采食量有显著的互作效应（ P＜0．05）。2）低能量水平组的可消化氮显著低于中能量水平组与高能量水平组（ P＜0．05）；低蛋白质水平组的进食氮、可消化氮、沉积氮、氮表观消化率均极显著低于中蛋白质水平组和高蛋白质水平组（ P＜0．01）。3）总能消化率和总能代谢率均随着能量水平的提高而极显著地升高（ P＜0．01）；高蛋白质水平组的总能代谢率和消化能代谢率显著低于低蛋白质水平组（ P＜0．05）；能量和蛋白质水平对总能消化率、总能代谢率和消化能代谢率均产生显著或极显著的互作效应（ P＜0．05或P＜0．01）。本试验得到了陕北白绒山羊周岁羯羊能量和蛋白质需要量的回归方程，饲粮的消化能和代谢能分别以8．80～10．61 MJ／kg和7．34～8．76 MJ／kg较为适宜，粗蛋白质和可消化粗蛋白质分别以10．00％和7．34％为宜。
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