OVA levels greater than 2.5% helped the bread rise further through oven spring, which increased specific loaf volume. These improvements resulted from an increase in thermal coagulation of gas cell membranes and an increase in batter viscosity due to interactions between soy globulins and OVA that promoted starch granule aggregation. Thus, even though OVA levels greater than 2.5% increased the specific loaf volume, they also made the crust harder. As a result, the optimum OVA level is 1.25% of the rice flour.