Statistical analysis
Basic statistics were performed using the statistical software package SAS 9.13 (SAS Institute Inc., 2001) to calculate simple profile data. The correlation coefficients between the muscle fiber characteristics and other carcass traits were evaluated using the CORR procedure of SAS. Cluster analyses were conducted in order to generate the total fiber number classifications (low, intermediate, or high) and type 2b fiber composition classifications (low or high), using the FASTCLUS procedure in the SAS software
package.