Livestock Ear Tag Requirements in New Mexico: What Every Rancher Needs to Know
August 7, 2026
If you raise cattle, sheep, goats, swine, or other livestock in New Mexico, ear tag compliance is no longer optional — and the rules changed significantly in November 2024. A federal mandate now requires electronic identification (EID) ear tags for certain classes of cattle and bison moving across state lines, and the New Mexico Livestock Board (NMLB) layers its own branding and identification requirements on top of that federal baseline.
Whether you run a commercial cow-calf operation in the Pecos Valley, a small goat herd in the Rio Grande corridor, or a show operation heading to the state fair, understanding which animals need official ear tags — and exactly what type — keeps you legal, protects your herd in a disease outbreak, and preserves your access to interstate markets. This guide walks through every requirement you need to meet, from tag specifications to recordkeeping.
Which Animals Require Official Ear Tags in New Mexico
Under New Mexico Administrative Code, “livestock or animal” includes cattle, sheep, swine, bison, goats, horses, mules, asses, poultry, ratites, camelids, and farmed cervidae. Not every species faces the same tagging obligation, but several trigger mandatory official identification requirements under either federal or state rules — or both.
The federal rule does not add new classes of livestock to what previously required official ID; it simply requires those animals to have an EID tag. The covered classes are all sexually intact cattle and bison 18 months of age or older; all dairy cattle of any age (including dairy-beef cross calves); and cattle and bison of any age used for rodeo, recreational events, shows, or exhibitions.
All sheep and goats being moved, transported, driven, or otherwise transferred from one premises to another — or all of those presented for or requiring inspection — must bear a recorded means of identification. Swine, horses, and other species carry their own state and federal ID obligations detailed in the species-specific section below.
Pro Tip: Even if your cattle never leave New Mexico, a registered brand is still required under NMLB rules. Ear tags supplement — but do not replace — the state’s branding requirement for cattle.
Federal RFID Ear Tag Rule: What Changed in November 2024
USDA APHIS amended the animal disease traceability regulations to require that eartags applied on or after a date 180 days after publication of the final rule be both visually and electronically readable to be recognized as official eartags for interstate movement of cattle and bison. This rule became effective November 5, 2024.
Per 9 CFR Part 86, visual-only NUES tags are no longer acceptable as official identification for cattle and bison when applied on or after November 5, 2024. Visual-only NUES tags for cattle and bison placed in ears prior to this date are considered official for the life of the animal. That means you do not need to retag animals that already carry a valid visual tag — but any new tag you apply today must be an RFID-capable 840 tag.
New Mexico’s state veterinarian noted that 30,000 tags would be made available through the New Mexico Livestock Board from the USDA to help producers transition. She noted the old metal tag system, while reliable, is outdated, and that the new system will make the traceability process easier for all involved.
These changes enhance the ability of Tribal, State, and Federal officials, private veterinarians, and livestock producers to quickly respond to high-impact diseases currently existing in the United States, as well as foreign animal diseases that threaten the viability of the U.S. cattle and bison industries.
Important Note: The November 2024 rule applies to interstate movement only. Cattle that spend their entire lives on a single New Mexico premises and never cross a state line are not subject to the federal EID mandate — though NMLB branding rules still apply intrastate.
Official 840 RFID Ear Tag Requirements in New Mexico
The USDA rule requires newly applied cattle and bison official ID tags to have both a visual and electronic component. As of November 5, 2024, the only official tags that meet these requirements are 840 RFID tags.
Official EID tags are USDA-approved official tags that have a visible 15-digit number starting with 840 printed on them that matches the electronic chip inside the tag, are stamped with the US shield, and say “Unlawful to Remove.” These are tamper-evident, one-time-use devices — you cannot legally remove or transfer them to another animal.
Both HDX (half-duplex) and FDX (full-duplex) low-frequency ear tags meet U.S. standards for official EID, and either is acceptable for official purposes. Choose based on your reader equipment and herd management software if you use electronic scanning.
| Tag Feature | Requirement |
|---|---|
| Number format | 15-digit AIN beginning with “840” |
| Visual marking | Official U.S. shield imprinted on tag |
| Legal notice | “Unlawful to Remove” printed on tag |
| Technology | RFID (HDX or FDX low-frequency) |
| Use type | One-time use, tamper-evident |
| 900-series tags | Not accepted as official ID |
The only EID technology approved by APHIS is an 840 tag. 900-series tags do not fulfill the requirements of this rule because they are not approved as an official means of identification in the United States.
To purchase official 840 tags, you need a Premises Identification Number (PIN) or Location Identification Number (LID) for the property where your animals are housed. Only Animal Identification Number Device Managers can redistribute official 840 EID tags. Visit www.aphis.usda.gov/traceability and refer to the “How to Become an AIN Device Manager” section to learn more.
Species-Specific Ear Tag Rules in New Mexico
New Mexico’s identification rules vary meaningfully by species. Knowing exactly what applies to your operation prevents costly compliance gaps.
Cattle and Bison
The 2024 federal rule applies to sexually intact cattle at or over the age of 18 months; all female dairy cattle of any age; male dairy cattle born after March 11, 2013; and all cattle used for rodeo, showing, or exhibitions. Beef feeder cattle under 18 months are generally exempt from the EID requirement unless a disease program or destination state requires it.
Under NMLB rules, cattle must still carry a New Mexico registered brand for intrastate identification. Exhibition livestock, including sheep, goats, cattle, and swine, may be identified with an official EID tag as an accepted means of identification, but cattle will still be required to have a New Mexico registered brand. Dairy operations have a separate pathway: the alternate means of identification for dairy cattle is the use of plastic eartags that meet specific requirements, combined with a New Mexico registered brand or the New Mexico Department of Agriculture milk permit number.
Sheep and Goats
Sheep and goats fall under the USDA National Scrapie Eradication Program, which carries its own mandatory tagging requirements separate from the cattle RFID rule. All sexually intact sheep and goats to be shown in fair market or breeding classes must bear an official USDA Scrapie tag in the ear. Registered breeding goats may use a legible breed registry tattoo in lieu of a Scrapie tag.
All owners of sheep and goats in New Mexico are required to have a wool/hair brand registered with the New Mexico Livestock Board, and such brand is the sole property of the recorded owner. When moving animals, all sheep and goats being moved, transported, driven, or otherwise transferred from one premises to another must bear a recorded means of identification.
For sheep entering New Mexico from another state, all sheep and goats must be accompanied by a permit previously procured from the NMLB, along with an official health certificate issued by a state inspector, a USDA inspector, or an accredited veterinarian attesting the animals are apparently free from infectious or contagious disease.
Swine
Swine identification in New Mexico follows the Universal Swine Earnotch (1-3-9) system for intrastate purposes. The universal swine earnotch system uses notches cut in the ears at specific locations corresponding to number values. The notch values added together provide identification numbers for the pig — the right ear’s value is the litter number, and the left ear’s value is the individual pig number in that litter. For exhibition swine, an official EID tag is also an accepted form of identification under NMLB rules.
Horses, Mules, and Asses
Equine are not subject to the federal 840 RFID ear tag mandate, but they do carry identification requirements for movement. All equidae — including horses, mules, and asses — entering New Mexico must be accompanied by an official health certificate attesting the animals in the shipment are free from symptoms of infectious or contagious disease. All equidae entering New Mexico must also be tested negative, within 12 months prior to entry, for equine infectious anemia (EIA) using the Coggins test or a USDA-licensed equivalent test approved by the board.
Within the state, horses may be identified by a horse identification card (NMLB Form 1-H or 1-HA) showing individual markings and scars, or by a registered brand. Ear tags are not the primary identification method for equine in New Mexico.
Where to Get Official Ear Tags in New Mexico
You have several options for sourcing official 840 RFID ear tags in New Mexico, ranging from free state-distributed tags to commercial purchase through approved vendors.
- New Mexico Livestock Board (NMLB): The state veterinarian confirmed that 30,000 tags were made available through the NMLB from USDA funding to help producers comply with the November 2024 rule. Contact the NMLB at (505) 841-6161 to check current tag availability.
- USDA-Approved Manufacturers: Three companies account for the bulk of 840 tag sales in the United States: Allflex (headquartered in Dallas, TX), Datamars (headquartered in Switzerland with an office in Temple, TX), and Y-Tex (headquartered in Cody, WY).
- Veterinary Supply Distributors and Farm Stores: Tags are available through veterinary supply distributors, farm supply stores, and directly from manufacturers.
- Your Accredited Veterinarian: Accredited veterinarians can apply official tags and help you register your premises identification number if you have not already done so.
RFID 840 tags cost between $2 and $5 per tag, depending on the manufacturer, tag style, and order quantity (as of early 2026). Many state veterinarian offices distribute free 840 RFID tags to producers, but supply has been uneven. Call the NMLB early in the season to confirm availability before you need to tag animals for movement.
Pro Tip: You must have a valid Premises Identification Number (PIN) before you can order official 840 RFID tags from a manufacturer or distributor. Register your premises through the NMLB or directly through USDA APHIS at aphis.usda.gov/traceability before placing your first tag order.
For scrapie tags for sheep and goats, contact the NMLB or your accredited veterinarian. USDA-provided scrapie tags are typically white or blue (slaughter-only designation), and producers in the voluntary Scrapie Flock Certification Program may have tags imprinted with SFCP.
How and When to Apply Ear Tags in New Mexico
Proper tag application protects both the animal and the integrity of the identification. A tag that falls out before movement or inspection creates compliance problems and requires retagging with updated records.
Placement and Technique
Place the tag in the middle third of the ear, between the two cartilage ribs, avoiding blood vessels, and follow brand-specific instructions for the applicator. For sheep and goats, plastic tags work best for animals that require shearing. If you use metal tags, place them in the left ear, about a third of the way down from the head where they are easier to see.
Clean the applicator and the ear before tagging. Ensure firm closure of the tag, and check retention before animals leave the chute. A loose or improperly closed tag is more likely to be lost during transport, which can trigger a compliance issue at the point of inspection.
Timing
Apply the official tag well before movement — at processing, preconditioning, or prior to sale or shipment — to avoid delays. For cattle headed to a New Mexico county or state fair, all in-state junior livestock (cattle, sheep, goats, and swine) to be shown must have an approved NM Youth Exhibitor Fair Tag applied by an Extension Agent, FFA Advisor, or designated fair personnel, and must have a New Mexico Livestock Board Form 1 Inspection before entering the fair.
The NMLB Form 1 Inspection for the show season must occur before July 15th of the current show season. Plan your tagging day well ahead of that deadline if you are showing animals at county or state fairs.
Lost or Damaged Tags
If an animal loses its official tag, you must retag it before it moves. If you apply a new EID tag to an already officially identified animal, you must record both tag numbers and the date the new tag was applied. For exhibition animals, if a tag is lost or damaged, the County Extension Agent and teacher determine the validity of the loss and, if valid, can assign a replacement tag. The agent must report any changes in tags immediately to update the county list, and exhibitors must contact the Livestock Inspector to update the Form 1 with the new ear tag number.
Ear Tag Requirements for Interstate Movement in New Mexico
Moving livestock across state lines from or into New Mexico triggers both federal and state-level requirements. Getting these right before your animals leave the premises avoids delays, fines, and potential quarantine.
A health certificate or other approved New Mexico Livestock Board document from the state of origin and a New Mexico entry permit are required on all shipments of cattle entering New Mexico. Upon arrival at the destination, the owner or agent must notify the NMLB inspector to make arrangements for inspection of the shipments prior to commingling.
All horses, mules, asses, cattle, and bison entering New Mexico from another state must have an entry permit. You can obtain a 24/7 entry permit online through the New Mexico Livestock Board website or by calling the permit line at (800) 432-6889.
For cattle and bison leaving New Mexico for another state, the animal must carry an official 840 RFID tag if it falls into one of the covered classes. If animals are crossing state lines and official ID is required, all parties involved are responsible for the animals and need to know the requirements of the state of destination — including the breeder, livestock market, shipper, hauler, broker, veterinarian, and buyer.
| Species | Entry Permit Required | Health Certificate Required | Official Ear Tag Required |
|---|---|---|---|
| Cattle / Bison (covered classes) | Yes | Yes | Yes — 840 RFID |
| Sheep / Goats | Yes | Yes | Yes — USDA Scrapie tag |
| Horses / Mules / Asses | Yes | Yes (+ negative Coggins) | No official ear tag required |
| Swine | Varies | Yes | Per federal/state program rules |
There are some exceptions to the EID ruling, including cattle moved as a commuter herd with a commuter herd agreement between states or tribes. If your operation straddles a state line and you have an existing commuter herd agreement, confirm with the NMLB whether your movement patterns qualify for this exemption.
For more on the broader legal framework governing livestock transport in New Mexico, see our guide on transporting livestock laws in New Mexico and livestock trailer requirements in New Mexico.
Recordkeeping Requirements for Ear-Tagged Animals in New Mexico
Owning properly tagged animals is only half the obligation. Federal and state rules require you to maintain written records that can be produced during an inspection or disease investigation. Gaps in your records can result in the same penalties as missing tags.
What Records You Must Keep
Inspection records must set forth the date of the inspection; the place where and the person by whom it was made; the name and current address of the owner, shipper, or claimant; the destination of the livestock; a list of all brands and earmarks on the livestock inspected; and the number and classification of the livestock.
For sheep and goat producers, USDA APHIS scrapie recordkeeping rules require you to record the following for each tagging event:
- The date the animals were officially identified
- The number of identified sheep and goats
- The official ID number — the complete number on the official USDA sheep/goat tag, official tattoo, or approved RFID device
- When you buy or sell animals, the date of purchase, sale, or other transfer
For cattle with 840 RFID tags, animal disease traceability information is housed in official federal and state databases that are not publicly available and are only accessible to federal and state government officials responsible for dealing with high-impact animal diseases. Your own records — the tag number, date applied, and premises ID — are what you need to maintain on-farm.
How Long to Keep Records
Federal animal disease traceability regulations under 9 CFR Part 86 generally require producers to retain records for a minimum of five years. This applies to records of official identification applied, animals moved, and any accompanying documentation such as certificates of veterinary inspection (CVIs) and owner-shipper statements. Keep all Form 1 Inspection documents from the NMLB in a secure location and make them available to any NMLB inspector or USDA official upon request.
Pro Tip: Keep a running log that pairs each animal’s tag number with the date it was tagged, the premises where it was tagged, and any subsequent movement records. A simple spreadsheet or herd management software entry takes minutes per animal and gives you a defensible paper trail if an inspector or disease investigator asks questions.
Nothing in the NMLB rules exempts any owner of livestock from possessing necessary bills of sale or proof of ownership for their livestock and presenting proof of ownership upon request. Bills of sale, brand registration certificates, and CVIs all form part of the complete compliance record New Mexico ranchers are expected to maintain.
If you move livestock to or from neighboring states, review the trailer and transport rules for those states as well. Requirements vary: see our articles on livestock trailer requirements in Texas (if applicable to your routes), livestock trailer requirements in Colorado, livestock trailer requirements in Oklahoma, and livestock trailer requirements in Kansas for state-by-state comparisons.
Staying Compliant as Rules Continue to Evolve
New Mexico livestock producers are operating under a dual-layer system: the NMLB sets intrastate branding and movement requirements, while USDA APHIS sets the floor for interstate identification. Both layers matter, and both can change. The November 2024 EID rule was the most significant update to cattle identification requirements in over a decade, and APHIS has signaled continued investment in the national traceability infrastructure.
Check the New Mexico Livestock Board website regularly for updated rules, fee schedules, and tag availability notices. For federal rule updates, monitor the USDA APHIS Animal Disease Traceability page. When in doubt, contact the NMLB at (505) 841-6161 or reach out to your accredited veterinarian before you move animals — it is far easier to tag correctly before departure than to resolve a compliance issue at a state line or livestock market.
Producers in other states can also review how their requirements compare. Our guides cover livestock trailer requirements in Wyoming, livestock trailer requirements in Arizona, livestock trailer requirements in Nevada, and many other western and southern states to help you plan multi-state movements with confidence.