However, there is more variation within each breed, than among the most different breeds . Figure 10A indicates the amount of change that could be expected in shear force by selecting Pinzgauer instead of Nellore purebred cattle relative to the within-breed variation . For F1 progeny this same comparison results in 2.38 genetic standard deviations between Pinzgauer- and Nellore-sired progeny , although only 1.43 phenotypic standard deviations are realized among Pinzgauer- and Nelloresired progeny . Thus, the realized improvement in tenderness from selecting one breed over another will be small . To make additional improvement within a breed requires identifying those sires whose progeny produce more tender meat, either through progeny testing or some direct measure on the sire and dam to predict the tenderness of their progeny.