Individual Grading Standards (Common Core)
Greater China Common Resource Evaluation Standard - Unified Standard Led by China, the Birthplace of the WRO System
Overview
In the Greater China region, the individual grading system is unified under standards based on Mainland China. Using a 25-level scale defined by two axes—grade (A5–C1) and yield (Y1–Y5)—it provides a comprehensive assessment of quality and processing efficiency. An electronic traceability system enables complete history management, from place of acquisition to processing facility and inspector ID.
Quality Grade Axis
The overall quality of an individual is evaluated using quality grades from A5 to C1.
| Grade | Overview |
|---|---|
| A5 | Top grade. Highest quality in all aspects including texture, fat, and mental stability. |
| A4 | High grade. May increase due to commercial scoring and other factors. |
| A3 | Upper standard. Typical high-quality individual. |
| B2 | Standard. Suitable for processed product use. |
| C1 | Lowest grade. Unsuitable for display. For leather products, feed, and fertilizer. |
Yield Grade Axis
Usability and processing efficiency are evaluated using yield grades from Y1 to Y5.
| Yield | Overview |
|---|---|
| Y1 | Highest yield. Can be processed efficiently with no waste. |
| Y2 | High yield. Optimal for standard processing. |
| Y3 | Standard yield. Typical efficiency. |
| Y4 | Low yield. Processing losses are likely to occur. |
| Y5 | Lowest yield. Limited to special uses. |
Required Measurement Items
-
Skin Surface Homogeneity
Measurement by high-resolution scan -
Body Composition (Fat to Muscle Ratio)
Bioelectrical Impedance + MRI
-
Bone Mass Index (DEXA, etc.)
Bone density measurement by DEXA method -
Electronic Traceability
History Management via QR/Ledger (Collection Site, Processing Facility, Inspector ID)
Mainland China (Directly Administered Model) - Reference Source
Positioning
Serves as the standard "reference source," holding authority to audit and re-certify other regions.
Operational Characteristics
-
Numerical Focus and Industrial Optimization
Quantitative indicators such as fat distribution, muscle fiber density, and processing yield carry the greatest weight. -
Central Re-Grading
Imported lots are re-inspectable upon arrival in Mainland China, allowing grade changes. -
Purpose-Based Sub-Tags
At the distribution stage, products are subdivided into categories such as "banquet," "household use," and "processing raw material."
Additional Evaluation Items (Mainland China-Specific)
- Stable Supply Index (Lot Homogeneity)
- Aging Suitability Score (Storage and Logistics Tolerance)
Key Points of Common Core
5 levels from A5 to C1
5 levels from Y1 to Y5
Combined evaluation of 25 levels
Mainland China