The zero-field-cooled (ZFC) magnetization behavior of powders and sintered solid pieces having arbitrary shapes and sizes of three different ferrimagnetic oxides, NiFe 2 O 4 , CoFe 2 O 4 and SrFe 1 2 O 1 9 , has been compared to distinguish the contribution from magnetocrystalline and shape anisotropies on the general characteristics of the ZFC magnetization curves. It is observed that the general shape of the ZFC magnetization curve is mainly determined by the magnetocrystalline anisotropy. The minor effect on the shape of M Z F C curve due to sample geometry, apart from the changes in the magnitude of magnetization due to demagnetization effects, decreases with increasing anisotropy of the material.