The drying behavior of dairy cattle manure slabs were investigated in a convective tray-type dryer. Drying experiments were conducted on dairy cattle manure slasb with thicknesses of 5, 10, 15, and 20 mm at drying air temperatures of 90°C, 100°C, 110°C, and 120°C with drying air velocities of 0.5, 1, and 1.5 m/s. A diffusion model was used to describe the moisture transfer and then the effective diffusivity was determined for each temperature. The effective moisture diffusivity of dairy cattle manure slab varied from 1.67× 10-6 to 11.79×10-6m2/s. The temperature dependence of the diffusivity coefficient was also described by the Arrhenius-type relationship. The activation energy of dairy cattle manure slab was in the range of 14.41 to 19.46kJ/mol. Three drying models (i.e., Henderson and Pabis, Lewis, and Page) were fitted to the experimental data. Based on the root mean square error values, the Page model showed the best fit of the three models.