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Research   »   Carcass Grading

Carcass Grading

Beef carcass grading is an important step in delivering consistent beef products to consumers. Grading places carcasses into uniform groups of similar quality. The information collected through the grading process is used in making marketing and production decisions. Producers receive premiums for carcasses with a high grade. While the grading system is voluntary, virtually all fed beef carcasses processed commercially in Canada are graded.

On this page

Key Points

  • The quality grade measures numerous characteristics that reflect the eating quality of the beef
  • Carcasses from youthful cattle may receive a quality grade of Canada Prime, A, AA, AAA or B1-B4 
  • Carcasses from mature cattle may receive a grade of D1-D4 or E.
  • In youthful cattle, yield grades 1, 2, 3, 4 or 5 estimate the percentage of the carcass that is saleable at retail
  • As of January 15, 2019, Canadian and U.S. Retail Yield grades 1 to 5 are both based on external fat depth, ribeye area, hot carcass weight and an estimate of kidney, pelvic and heart fat (KPH)


What is a Beef Carcass?

As indicated in Canada’s Beef, Bison and Veal Carcass Grade Requirements, a beef carcass is the carcass of a slaughtered bovine animal that is produced for beef and has had the following removed, namely:

(a) the hide,
(b) the portion of the head and neck forward of the first cervical vertebra,
(c) the portion of the foreshank below the carpal (knee) joint and the portion of the hindshank below the tarsal (hock) joint,
(d) the respiratory, digestive, reproductive and urinary systems and the thoracic and abdominal organs,
(e) the membranous portion of the diaphragm and the pillar of the diaphragm,
(f) the spinal cord,
(g) the kidney fat, pelvic fat, heart fat and scrotal or udder fat,
(h) the tail posterior to the first coccygeal vertebra and
(i) any portion of the carcass the removal of which is required for pathological reasons under the Safe Food for Canadians Regulations.

How Canadian Beef is Graded

Carcass Grading
AAA Stamp

The Canadian beef grading system follows standards overseen by the Government of Canada based on industry and government recommendations. The Canadian Beef Grading Agency (CBGA), a private, non-profit corporation, is accredited by the Canadian Food Inspection Agency to deliver grading services for beef in Canada. Trained graders visually assess the whole carcass based on several criteria and assign a grade.

All carcasses graded Canada A or higher receive both a quality grade and a yield grade. 

Carcass Quality Segregation
Click to enlarge


Quality Grade

The quality grade measures numerous characteristics, which reflect meat quality. A beef carcass may only be graded after it has been inspected and approved for health and safety standards and bears a federal or provincial meat inspection legend or stamp.

Maturity The age of an animal affects the tenderness. Carcasses are categorized as youthful or mature.
Sex Pronounced masculinity in animals affects meat colour and palatability.
Conformation (muscling) Meat yield is influenced by the degree of muscling.
Fat (colour, texture and cover) Fat colour and texture influence consumer acceptability. Fat cover affects retail yield.
Meat (colour, texture and marbling) Marbling affects eating quality for juiciness and tenderness. Colour and texture influence consumer acceptability.

Canada Prime: The highest marbled quality beef carcasses are given the Canada Prime grade. Canada Prime represents carcasses with at least “slightly abundant” marbling. In 2017, the Canada Prime grade represented 2.3% of all graded beef from fed slaughter cattle in Canada.

A Grades: Canada A grades (A, AA, AAA) are also high-quality grades, representing increasing degrees of marbling from Canada A to AAA respectively. The segregation into different marbling ranges permits consumers, retail and food service options in fat content. In 2021, the Canada A, AA and AAA grades together represented 98.4% of all graded beef from fed slaughter cattle in Canada.

B Grades: The B grades are for youthful carcasses that fail to meet one or more of the quality requirements of the A grades. In 2021, B grades represented 1.6% of all graded beef from fed slaughter cattle in Canada. Some beef from B-grade carcasses may be used in fast food service.

Carcasses graded as B4 are called dark cutters. They are visually unappealing and have a higher pH than typical beef. Beef from dark cutters is often used in further processed products.

D Grades: The D grades are applied to carcasses which are not youthful. They are typically given to carcasses from cows and represented 11.8% of the total graded cattle in Canada in 2021. Beef given a D grade is typically used for ground beef and further processed products. However, with the D1 grade, whole muscle cuts may be used in low-cost food service enterprises.

E Grades: The E grade is reserved for mature bulls or youthful bull carcasses showing pronounced masculinity. This grade represented 0.4% of the total graded cattle population in Canada in 2021. These carcasses typically go into further processed products.

Because grading is voluntary, cows and bulls are often not graded and are labeled as "ungraded" beef when sold.

Canadian GradeMaturity (Age)MusclingRib Eye MuscleMarbling *Fat Colour and TextureFat Measure
CANADA PRIME Youthful Good to excellent with some deficiencies Firm, bright red Slightly abundant Firm, white or amber 2 mm or more
CANADA A, AA, AAA Good to excellent with some deficiencies Firm, bright red A - trace
AA - slight
AAA - small
Firm, white or amber 2 mm or more
B1 Good to excellent with some deficiencies Firm, bright red No requirement Firm, white or amber Less than 2 mm
B2 Deficient to excellent Bright red No requirement Yellow No requirement
B3 Deficient to good Bright red No requirement White or amber No requirement
B4 Deficient to excellent Dark red No requirement No requirement No requirement
D1 Mature Excellent No Requirement No Requirement Firm, white or amber Less than 15 mm
D2 Medium to excellent No requirement No requirement White to yellow Less than 15 mm
D3 Deficient No requirement No requirement No requirement Less than 15 mm
D4 Deficient to excellent No requirement No requirement No requirement 15 mm or more
E Youthful or Mature Pronounced masculinity (enlarged: hump, neck, crest, pizzle eye)

Yield Grade

When a carcass qualifies for Canada Prime or any of the Canada A grades, a prediction of carcass retail yield is also made.

Yield grades 1, 2, 3, 4 or 5 is an estimation of the percentage of the carcass that is saleable at retail.

Yield GradeEstimated Yield (%)
Canada 1 52.3 or more
Canada 2 52.34 to 50.0
Canada 3 47.7 or 50.0
Canada 4 45.4 to 47.7
Canada 5 Less than 45.4

A ruler developed by the Agriculture and Agri-Food Canada Lacombe Research Station, is used to measure the fat depth and ribeye length and width. These measures of fat and lean are then used to predict an overall carcass lean yield.

Ruler to measure beef fat depth and ribeye length and width

 Canadian beef retail cut yields 2021

 Canadian beef quality grades 2021

U.S. Grade Equivalency

The U.S. equivalent grade for Canada Prime is USDA Prime. Canada AAA, AA and A are equivalent to USDA Choice, Select and Standard respectively.

As of January 15, 2019, Canadian and U.S. Retail Yield grades 1 to 5 are both based on external fat depth, ribeye area, hot carcass weight and an estimate of kidney, pelvic and heart fat (KPH). These yield grades predict the percentage of closely trimmed, boneless retail cuts from the round, loin, rib and chuck.

Beef Grading Advancements

Evaluating and developing grading tools and sharing information are necessary to improve the grading process for the delivery of a consistent beef product and for sending signals back to producers for livestock production.

e+v Technology

Photo credit: Canadian Beef Grading Agency

One of the most recent developments is the computer vision grading system e+v Technology GmbH Beef Instrument Technology. It marks the first major advancement in the Canadian system since the Computer Vision System (CVS) camera was introduced in 1999. The e+v technology is approved for use as a grading aid by the Canadian Food Inspection Agency and enables improved grading accuracy under current grading regulations.

The e+v grading instrument is a stationary machine that photographs and analyzes the rib eye area between the 12th and 13th ribs of both sides of each carcass as it passes by on a moving rail. At present, the computer grading camera measures grade fat, rib eye width and rib eye length and then calculates a lean-yield percentage, providing a lean-yield grade and a marbling score. In some situations, such as where it is difficult for the camera to get an accurate reading, a grader can provide an overall assessment or override the camera's grading.

The technology is objective and assesses marbling under the same light and at the same distance from the rib eye based on minute calculations of red and white pixels within the traced muscle. This reduces the variability inherent with human assessment. The information captured can be stored, shared and further analyzed.

Information Sharing

A number of private industry initiatives are taking advantage of the developments in individual animal identification, instrument grading and information sharing systems to share individual carcass data back down the supply chain to previous owners of the animal. This information can help packing plants to procure cattle that will meet customer demands, help cattle feeders refine their nutritional and implant management strategies, help cow-calf producers bolster their bull selection and calf marketing efforts and help seedstock breeders with their selection programs. Over time, this is likely to contribute to enhancing the quality and yield of Canadian beef.

Current Research

Further research is currently underway to:
  • understand how animal production practices and postmortem processing factors affect beef grade and quality attributes
  • provide strategies to producers and processors for improving beef carcass grade and meat quality
  • increase understanding of how muscle biochemistry and structure relate to beef carcass grade and ultimate meat quality
  • produce an affordable, objective and portable beef grading machine prototype
Learn More

To learn more on this topic, see the fact sheets posted on the right side of this page. External resources are listed below.

Canadian Beef Grading Agency


Feedback and questions on the content of this page are welcome. Please e-mail us at info@beefresearch.ca.


Thanks to Cindy Delaloye, retired General Manager of the Canadian Beef Grading Agency, for contributing her time and expertise to developing this page.

This topic was last revised on January 27, 2022 at 2:50 AM.

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