The apparent viscosity data at 300 s of samples from varying conditions are shown in Table 2. When the logarithm of the apparent viscosity was plotted versus the reciprocal of absolute temperature (1=T, where T is Kelvin) (Fig. 2), a straight line was obtained Arrhenius model fitted reasonably well with the experimental data and gave high r2 (0.880–0.998) at a 95% confidence level. The estimated values of g1 and Ea for each fat content are shown in Table 3