Descriptive statistics of the database for heifers and steers (N = 1,517).

1 DOF = days on feed; REA = ribeye area; USDA YG = USDA Yield Grade; MBV = molecular breeding value; SNP = single nucleotide polymorphism.2 Marbling scores for USDA quality grades Standard (2 = practically devoid or 3 = traces), Select (4 = slight), low Choice (5 = small), Choice (6 = modest), high Choice (7 = Moderate), low Prime (8 = slightly abundant), and Prime (9 = moderately abundant).3P-value of χ2 test for frequency percent of 25:50:25 for CC, CT, and TT leptin genotypes, respectively.Descriptive statistics of the database for heifers and steers (N = 1,517).