Agricultural Quality Assessment Division G-36 Specification

Marketing 1400 Independence Avenue SW, Stop 0258 July 8, 2019

Service Washington, DC 20250 Page 1 of 2

USDA is an equal opportunity provider, employer, and lender.

Great Mark Western High Choice Beef Program

G-36 Specification

1 REQUIREMENTS

Beef carcasses certified under this specification shall meet the following requirements:

a. Classed as Steer or Heifer carcasses only1;

b. U.S. Prime or Choice and have a minimum marbling score of Modest 01

;

c. Less than 30 months of age with lean color, texture, and firmness, meeting the requirements for 

A maturity in the U.S. grade it qualifies for1

;

d. Medium or fine marbling texture1,2

;

e. Ribeye Area (REA) of 10.0 to 16.0 square inches3

;

f. Fat Thickness (FT) less than 1.0 inch4;

g. Moderately thick or thicker muscling and tend to be at least moderately wide and thick in 

relation to their length5;

h. No hump exceeding 2 inches in height6;

i. Practically free (not detracting from visual quality) of capillary rupture in the ribeye muscle; 

and

j. Free of “dark cutting” characteristics.

2 CERTIFICATION

Carcasses to be examined for compliance with this specification shall be clearly identified and 

presented to an AMS grader for certification. Certification procedures for identification, the removal 

of preliminary identification marks (or other methods of control) from non-qualifying carcasses, and 

control of certified carcasses shall be in accordance with established Quality Assessment Division 

(QAD) procedures.

 1 Determined in accordance with the “Official United States Standards for Grades of Carcass Beef.” 2 Evaluated using the USDA-AMS-LS-SB-02 Marbling Texture card (included in the Official USDA Marbling Photographs.) 3 REA is inclusive of the lower and upper limits and allows for one side to meet the standard to consider both eligible for certification. 4 FT is to be determined at the 12th rib and represent solely an evaluation of subcutaneous fat over the ribeye at a point 3⁄4 the lateral 

length of the eye muscle from the backbone. If the actual FT over the ribeye has been altered due to a hide pull, gouge, trim, or other 

irregularity, a predicted line shall be determined along the curvature of the ribeye to establish an accurate prediction of unaltered fat 

thickness at the 12th rib surface. FT may be determined on either side of the carcass with at least one side meeting the standard to 

consider both eligible for certification. 5 Muscle thickness is evaluated by averaging the thickness of the various parts, considering not only the proportion of each part of the 

carcass but also the general value of each part. Superior muscle thickness implies a high proportion of meat to bone and a high 

proportion of the weight of the carcass in the more valuable parts.

6 Measured from a line formed by the extension of the top line (including the fat) and measuring the lean muscle (excluding the fat) 

perpendicular to that line in the center of the hump.
Agricultural Quality Assessment Division G-36 Specification

Marketing 1400 Independence Avenue SW, Stop 0258 July 8, 2019

Service Washington, DC 20250 Page 2 of 2

USDA is an equal opportunity provider, employer, and lender.

3 LABELING

Labeling of products derived from certified carcasses must follow Food Safety and Inspection Service 

regulations and policy guidelines and QAD procedures.

4 FEES

The costs of all grading and certification services performed by an AMS grader involving 

examinations, supervision, official documentation, and related services shall be borne by the person, 

group, or plant requesting the service.

___________________________________

Chad Nelson, National Meat Supervisor

Quality Assessment Division

Livestock & Poultry Program