A comparison of Tables 13.9 and 13.10 reveals several differences resulting from the application of independent culling level versus selection index. In both cases, bull E would be identified as the most desirable. Bull D is culled using independent culling level due to inadequate scrotal circumference; however, in the selection index, bull D is ranked second because scrotal measurement was not included. On the other hand, bull C barely escapes culling under the independent culling level system with just acceptable performance in all three traits. The selection index ranks bull C next to last.