The disappearence rate in treatment ZnSO4 of DM, OM, CP, NDF, ADF in diets reduced to 2.45%,2.20%,1.64%,2.06%,4.04%,respectively, compared with the control, Zn-Met also declined 1.38%,1.16%,0.87%,0.63%,1.92%.

• 且ZnSO_4组日粮DM、OM、CP、NDF、ADF表观消化率较对照组分别降低了2.；45%25、2