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📅 Prepared March 4, 2026  |  🔄 Revised May 2, 2026

✍️ Dirk Adams

⌛ 9 min read

FAT RESEARCH SERIES — PRODUCTION

Farm Animal Transparency Research Series · Grass-Fed Labeling Research · Paper No. 6 · March 2026

Executive Summary

Most American consumers believe “grass-finished” is the stronger label claim—indicating beef from cattle that ate only grass through the end of their lives. In reality, the USDA’s Food Safety and Inspection Service (FSIS) treats “grass-fed” as the stricter term, requiring a 100% forage diet from weaning to slaughter, while “grass-finished” permits grain feeding earlier in life. This inversion of consumer expectations, combined with minimal federal enforcement and the absence of mandatory slaughter volume reporting for grass-fed cattle, creates a significant transparency gap in the U.S. beef supply chain.

This paper examines the regulatory history behind grass-fed labeling, the critical distinction between grass-fed and grass-finished as FSIS recognizes them, the role of third-party certifications in filling regulatory gaps, and the data blind spots that prevent consumers, researchers, and policymakers from understanding how much grass-fed beef actually reaches the market.

1. The Regulatory History of Grass-Fed Labeling

The federal definition of “grass-fed” beef has been a moving target for two decades. Understanding where the rules are today requires understanding the institutional dysfunction that brought them here.

1.1 The Rise and Fall of the AMS Standard

In 2006, the USDA’s Agricultural Marketing Service (AMS) established an official Grassfed Marketing Claim Standard intended to give the term a uniform federal definition. The standard required a 100% forage diet after weaning. However, enforcement was assigned to FSIS—a separate agency within USDA—and the two agencies never fully coordinated.

On January 12, 2016, AMS rescinded the standard entirely. In its Federal Register notice, AMS stated that having a strong labeling standard “does not facilitate the marketing of agricultural products in a manner that is useful to stakeholders or consumers” because FSIS, the agency that actually approves meat labels, might not recognize it. The National Sustainable Agriculture Coalition called the rationale “outrageous,” arguing that the solution was interagency coordination, not abandonment of the standard.

1.2 Regulatory Timeline

2. What FSIS Actually Recognizes

2.1 Grass-Fed: The Stronger Claim

Under current FSIS guidance, “grass-fed” (or “grassfed” or “grass-fed”—FSIS considers all three spellings synonymous) may only be applied to meat from cattle that were fed exclusively forage after weaning from their mother’s milk. Specifically, FSIS requires that:

• The diet must be 100% derived from forage, including grass (annual and perennial), forbs, legumes, brassicas, browse, hay, haylage, baleage, silage, corn silage, crop residue without grain, and other roughage sources.
• Animals cannot be fed grain or grain by-products.
• Animals must have continuous access to pasture during the growing season until slaughter.
• Animals cannot be confined to a feedlot.
• Routine mineral and vitamin supplementation is permitted.

2.2 Grass-Finished: The Weaker Claim

Contrary to widespread consumer understanding, FSIS treats “grass-finished” as a distinct and weaker claim than “grass-fed.” Under FSIS labeling rules, grass-finished animals may receive grain during their lifetime—only the final finishing phase needs to be on grass. A label stating “Grain Fed, Grass Finished” would be considered truthful and not misleading by FSIS. This is the exact opposite of what most consumers believe.

2.3 The Partial Claim Loophole

FSIS also permits partial grass-fed claims. Producers who feed grain can use the “grass-fed” label as long as they disclose the percentage: “90 percent grassfed,” “75 percent grassfed,” or even “10 percent grassfed.” While technically transparent, these partial claims appear alongside “100% grass-fed” products on store shelves with no standardized visual hierarchy to help consumers distinguish between them.

2.4 Enforcement: The Affidavit Problem

All grass-fed label claims require official FSIS approval before use in commerce. However, the documentation standard is remarkably low. A signed affidavit from the producer is typically considered sufficient to substantiate the claim. Many farms operating under grass-fed labels are never audited. The USDA does not “certify” grass-fed beef—it merely approves labels based on producer assertions.

3. Third-Party Certifications: Filling the Gap

Because the federal framework provides minimal assurance, third-party certification programs have emerged as the primary mechanism for consumers seeking verified grass-fed beef. Three programs dominate the market.

3.1 Certification Comparison

3.2 American Grassfed Association (AGA)

The AGA certification, introduced in 2009, is the oldest and most widely recognized third-party grass-fed standard in the United States. AGA-certified animals must be born, raised, and finished on open grass pastures where grasses, forbs, legumes, and other forage sources are the sole energy source from birth to harvest (excluding mother’s milk). The standards also prohibit antibiotics, added hormones, and feedlot confinement, and require all animals to be born and raised on American family farms. Certified producers are inspected by independent third parties at least every 15 months. If an animal requires antibiotic treatment, it must be treated but is then removed from the certified program. The per-head certification fee is $1.50 for large ruminants.

3.3 Certified Grassfed by A Greener World (AGW)

The AGW grassfed certification is arguably the most stringent available, in part because it cannot stand alone. It is an optional add-on to the Animal Welfare Approved (AWA) certification—producers must first meet AWA’s comprehensive animal welfare standards before they can qualify for the grassfed seal. The diet standard requires that all feed be solely derived from grass and forage throughout the animal’s entire life, with no grain, grain by-products, or feed concentrates permitted. AGW also requires birth-to-slaughter traceability and prohibits conversion of primary or old-growth forest for grazing land.

3.4 USDA Process Verified Program (PVP)

The PVP is not a standard in the traditional sense. It is a USDA-administered audit program that verifies whether a producer is following its own stated protocols. The producer defines what “grass-fed” means within their operation, and USDA audits for compliance with that self-defined standard. Because there is no uniform baseline, two PVP-verified operations may have materially different practices while both carrying USDA verification.

4. The Volume Data Blind Spot

4.1 What Federal Data Exists

USDA’s National Agricultural Statistics Service (NASS) tracks total commercial cattle slaughter by class (steers, heifers, cows, bulls) and by region. In 2024, total commercial cattle slaughter was 31.8 million head. However, there is no mandatory federal reporting that breaks slaughter volume out by feeding program. The Livestock Mandatory Reporting system captures grid premiums for some specialty categories—“All Natural” and “NHTC” (Non-Hormone Treated Cattle) appear as line items in the LM_CT169 report—but there is no “grass-fed” category on the packer grid.

4.2 The Best Available Estimate

The most widely cited figure for domestic grass-fed slaughter comes from South Dakota State University Extension, which estimated approximately 230,000 head slaughtered annually as of 2015–2016—less than 1% of total conventional slaughter. At that time, there were roughly 3,900 grass-fed producers in the U.S., up from about 100 in 1998, but the vast majority marketed fewer than 50 animals per year through direct sales. No updated federal count has been published since.

4.3 The Import Complication

Any estimate of grass-fed market volume is further complicated by imports. Because USDA standards for grass-fed labeling are relatively easy to meet, imported beef from countries like Australia, New Zealand, Uruguay, and Brazil can qualify for the grass-fed label. Industry estimates suggest that imports account for 75–80% of all labeled grass-fed beef sold in the United States. Until 2024, these imported products could be labeled “Product of USA” simply by passing through a USDA-inspected processing plant. The 2024 FSIS rule change now requires that “Product of USA” claims be limited to animals born, raised, slaughtered, and processed domestically, though compliance timelines extend into 2026.

4.4 The USDA Grass Fed Beef Report

The only USDA report specifically covering grass-fed beef is the National Grass Fed Beef Report, published quarterly. However, this is a voluntary survey that captures direct-to-consumer retail pricing and carcass hanging-weight prices. It does not report head counts, packer throughput, or total production volume. It provides a useful snapshot of farm-gate pricing but cannot answer the fundamental question of how much grass-fed beef is being produced.

5. The Over-30-Months Intersection

An additional layer of opacity involves the age profile of grass-fed cattle at slaughter. Conventional grain-fed cattle are typically finished at 18–20 months of age. Grass-fed cattle, because they gain weight more slowly on forage, commonly require 24–30 months or more to reach slaughter weight. Over 95% of U.S. fed steers and heifers are under 30 months of age based on dentition assessments at harvest.

FSIS requires packing plants to segregate carcasses by dentition into two age groups—under 30 months and 30 months or older—for specified risk material (SRM) removal related to BSE prevention. The LM_CT169 report publishes the OTM (Over 30 Months) discount applied by major packers, which currently sits at a weighted average of -$16.68 per hundredweight. However, neither the segregation data nor the discount data includes head counts. There is no public reporting of how many OTM carcasses move through the system in any given week, and no cross-referencing with grass-fed or any other marketing claim.

This means it is impossible to determine from public data how much grass-fed beef processed by the major packers (JBS, Tyson, Cargill, National Beef) comes from cattle over 30 months of age—a category where grass-fed animals are disproportionately represented.

6. Key Findings

1. FSIS treats “grass-fed” as the stronger claim (100% forage from weaning, no feedlot confinement) and “grass-finished” as the weaker claim (grain permitted earlier in life). This is the inverse of how most consumers interpret these terms.
2. Federal enforcement relies primarily on producer affidavits, not audits. Without third-party certification (AGA, AGW), there is no independent verification that grass-fed claims are accurate.
3. No mandatory federal reporting exists for grass-fed slaughter volume. The best available estimate (230,000 head, circa 2015–2016) is nearly a decade old, and no agency is tracking how this number has changed.
4. Imports account for an estimated 75–80% of labeled grass-fed beef sold in the U.S., and recent Product of USA rule changes may not fully resolve origin transparency until 2026 compliance deadlines pass.
5. The intersection of grass-fed production and over-30-months age classification is a data black hole. FSIS requires OTM segregation at slaughter, and LM_CT169 reports the OTM discount, but neither system publishes volume data or cross-references marketing claims.
6. Partial grass-fed claims (“75% grassfed”) are permitted by FSIS and can appear on retail shelves alongside 100% grass-fed products with no standardized visual differentiation for consumers.

7. Implications for Consumers

For consumers seeking genuine grass-fed beef, the federal label alone provides limited assurance. The most reliable approach is to look for third-party certification logos—particularly AGA or Certified Grassfed by AGW—which require independent audits and enforce standards that go beyond FSIS requirements to include antibiotic and hormone restrictions, pasture access, and in the case of AGA, domestic origin.

Consumers should be aware that a label reading “grass-finished” without additional certification may indicate an animal that received grain for a significant portion of its life. And any “grass-fed” label without a third-party seal is backed only by a producer’s signed statement—not an audit.

The FAT (Farm Animal Transparency) app is designed to help consumers navigate exactly these labeling complexities at point of purchase, using OCR scanning to identify and evaluate claims on meat packaging against the actual regulatory and certification standards behind them.

Sources

• USDA AMS, Livestock Mandatory Reporting Act; 7 U.S.C. §§ 1635–1636h.
• FSIS Labeling Guideline on Documentation Needed to Substantiate Animal Raising Claims (FSIS-GD-2024-0006), updated 2024.
• AMS withdrawal of the Grassfed Marketing Claim Standard, 81 Fed. Reg. 3 (Jan. 5, 2016).
• South Dakota State University Extension, “Grass-Fed Beef: Market Share of Grass-Fed Beef,” 2021.
• American Grassfed Association, “Our Standards,” americangrassfed.org.
• A Greener World, “Certified Grassfed by AGW Standards,” agreenerworld.org.
• Carolina Farm Stewardship Association, “Food Labels & Claims, Defined.”
• Beef Research, “Modernization of the U.S. Standards for Grades of Carcass Beef,” beefresearch.org.
• University of Maine Cooperative Extension, Bulletin #1072, “Understanding Beef Yields.”
• UC ANR Niche Marketing Livestock in California, “The Who, What, and How’s of Labels.”
• USDA NASS, Livestock Slaughter 2024 Summary (April 2025).
• USDA AMS, National Grass Fed Beef Report (Quarterly), Q4 2025.
• National Sustainable Agriculture Coalition, “USDA Revokes Grass Fed Label Standard,” January 12, 2016.

Farm Animal Transparency • farmanimaltransparency.org • Grass-Fed Labeling Research Series • Paper No. 6 • March 2026

Additional References

1. USDA FSIS. “FSIS Guideline on Substantiating Animal-Raising or Environment-Related Labeling Claims.” 2024. www.fsis.usda.gov.
2. Daley, C.A., et al. “A Review of Fatty Acid Profiles and Antioxidant Content in Grass-Fed and Grain-Fed Beef.” Nutrition Journal 9 (2010): 10. pmc.ncbi.nlm.nih.gov.
3. Nogoy, K.M.C., et al. “Fatty Acid Composition of Grain- and Grass-Fed Beef.” Food Science of Animal Resources 42, no. 1 (2022): 18-33. pmc.ncbi.nlm.nih.gov.
4. Varre, J.V., et al. “Nutritional Composition of Beef.” J. Animal Science (2025), DOI: 10.1093/jas/skaf436. academic.oup.com.
5. Krusinski, L., et al. “Attention to the Details: U.S. Grass-Fed Cattle Variations.” Frontiers in Sustainable Food Systems 6 (2022): 851494. www.frontiersin.org.