While other traits are analyzed using an animal model, the carcass evaluation uses a sire/maternal grandsire multiple-trait mixed model to determine sire Expected Progeny Differences (EPDs) for carcass weight, USDA marbling score, 12th-rib fat thickness and ribeye area. Interim pedigree estimated EPDs for carcass traits receive an ACC of .05. The carcass data are phenotypically described in Table 1 with average adjusted measurements. Carcasses were adjusted to 480 days of age-at-slaughter.
The scoring system for marbling and its relationship to the USDA Quality Grading System is defined in Table 2. For a carcass to meet Certified Angus Beef (CAB) standards, it must have a Modest ( average Choice) or higher marbling degree, be of “A” maturity (the most youthful classification for beef), be USDA Yield Grade (YG) 3 or leaner (YG 1.0 through YG 3.9 accepted) and have a fine to medium marbling texture.
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