Marbling intramuscular fat is the intermingling or dispersion of fat within the lean.
Which cut of beef has the most marbling.
Graders evaluate the amount and distribution of marbling in the ribeye muscle at the cut surface after the carcass has been ribbed between the 12th and 13th ribs.
The usda defines an extra lean cut of beef as a 3 5 ounce serving about 100 grams that contains fewer than 5 grams total fat 2 grams of which are saturated fat and 95 milligrams of cholesterol.
When beef graders yes there are people who grade beef for a living are grading beef they specifically look at amount of marbling in the ribeye muscle between the 12 th and 13 th ribs.
Beef carcass quality grading is based on 1 degree of marbling and 2 degree of maturity.
Choice has less marbling than prime and select has the least marbling of all.