Livestock Ear Tag Requirements in Connecticut: What Every Producer Needs to Know
July 16, 2026
If you raise cattle, sheep, goats, swine, or other livestock in Connecticut, official ear tag requirements affect nearly every animal that leaves your property — whether headed to a sale barn, a state fair, or a farm across state lines. Getting identification wrong can mean fines, rejected animals at a show, or animals turned back at a state border.
This guide walks you through exactly which animals need official ear tags in Connecticut, what changed with the federal RFID mandate that took effect in November 2024, how to get approved tags, when to apply them, and what records you must keep. The rules come from two sources — federal USDA/APHIS regulations and Connecticut Department of Agriculture requirements — and both apply to you.
Which Animals Require Official Ear Tags in Connecticut
Federal animal disease traceability (ADT) regulations cover several livestock species, and Connecticut enforces these requirements for both intrastate and interstate movement. Under federal regulations in 9 CFR Part 86, the following categories of cattle and bison are subject to official identification requirements for interstate movement: all sexually intact cattle and bison 18 months of age or over; all female dairy cattle of any age and all male dairy cattle born after March 11, 2013; cattle and bison of any age used for rodeo or recreational events; and cattle and bison of any age used for shows or exhibitions.
Beyond cattle and bison, sheep and goats are subject to mandatory federal identification under the National Scrapie Eradication Program. This is a mandatory USDA identification program for sheep and goats, covering all sheep over 18 months of age; sexually intact sheep under 18 months of age that are sold for breeding or exhibition; sheep sold unrestricted; sheep not in slaughter channels; and sheep that have lambed or are pregnant.
Swine moving through Connecticut also require official identification. For slaughter swine and feeder swine, an eartag or tattoo bearing the Premises Identification Number assigned by the State Animal Health Official to the premises on which the swine originated is required. Connecticut’s 2025 fair and show requirements confirm that all swine must have an approved official USDA identification, and a Certificate of Veterinary Inspection (CVI) issued within 60 days prior to the first show by an accredited veterinarian.
Pro Tip: Even if your animals never leave Connecticut, official identification is still required when ownership changes or animals move to a livestock market. Contact the Connecticut Department of Agriculture’s Bureau of Regulatory Services to confirm current intrastate requirements for your species.
Federal RFID Ear Tag Rule: What Changed in November 2024
The single biggest shift in livestock identification in over a decade took effect on November 5, 2024. USDA’s Animal and Plant Health Inspection Service (APHIS) amended the animal disease traceability regulations to require that eartags applied on or after November 5, 2024 be both visually and electronically readable in order to be recognized for use as official eartags for interstate movement of cattle and bison covered under the regulations.
USDA’s final 2024 Animal Disease Traceability rule only changes the type of tag that can be used — it does not change the class of animals that are required to be tagged. In other words, the same categories of cattle and bison that needed official ID before still need it; they just now need an RFID-capable tag instead of a visual-only tag.
If your animals were already tagged before the rule took effect, you do not need to retag them. 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 will be considered official for the life of the animal and need not be replaced.
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. The rule was published in the Federal Register on May 9, 2024, giving producers 180 days to prepare.
Official 840 RFID Ear Tag Requirements in Connecticut
The 840 RFID tag is the standard official identification device for cattle and bison in the United States. Official EID tags are 15 digits long, starting with “840-“, bear the U.S. shield, and state “Unlawful to Remove.” Official EID tags begin with 840- and are nationally unique, also bearing the U.S. shield and the statement that they are “Unlawful to Remove.”
Each electronic ear tag stores a unique 15-digit identification number that follows the ISO 11784/11785 international standard. Electronic ear tags are RFID-enabled identification devices that attach to an animal’s ear and contain a microchip with a unique identification number. Unlike traditional visual ear tags that rely on printed numbers, electronic tags can be read automatically by RFID scanners — enabling faster processing, more accurate record-keeping, and compliance with federal animal disease traceability requirements.
Before you can purchase official 840 RFID tags, you need a Premises Identification Number (PIN). In order to purchase 840 EID tags, you must have a Premises Identification Number (PIN) assigned. Connecticut producers can obtain a PIN through the Connecticut Department of Agriculture or through the USDA APHIS Animal Disease Traceability program. Once you have your PIN, you can order tags directly from approved manufacturers or check whether the state has free tags available.
Key Insight: Visual-only 840 tags and RFID-capable 840 tags can look nearly identical. Before ordering, confirm with the manufacturer or distributor that the tag you are purchasing is RFID-capable. If you cannot tell by looking at a tag, ask your veterinarian or state animal health official to verify it before you apply it.
| Tag Feature | Requirement |
|---|---|
| Number format | 15-digit Animal Identification Number (AIN) starting with “840” |
| Readability | Both visually and electronically readable (RFID) |
| Required markings | U.S. shield and “Unlawful to Remove” |
| Tag use | One-time use (tamper-evident) |
| Prerequisite | Valid Premises Identification Number (PIN) |
| Effective date | Required for all tags applied on or after November 5, 2024 |
Species-Specific Ear Tag Rules in Connecticut
Cattle and Bison: As of November 5, 2024, all covered cattle and bison receiving new official identification must use an RFID-capable 840 tag. The 2024 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. Feeder cattle under 18 months heading directly to slaughter are generally exempt from the EID requirement under federal rules, though Connecticut or the destination state may impose additional requirements.
Sheep: Sheep fall under the federal National Scrapie Eradication Program, which has its own separate identification system. The Code of Federal Regulations Part 79.2 and the National Scrapie Eradication Program Standards allow sheep and goats to be officially identified with registry tattoos for movement in interstate commerce with some exceptions. Approved tags include flock ID tags, serial number tags issued to accredited veterinarians, and 840 RFID tags. Visual-only NUES tags remain official options for sheep and goats for which they are approved — unlike cattle, the November 2024 RFID mandate does not apply to small ruminants. Connecticut’s 2025 fair requirements confirm that sheep exhibited at state fairs must carry official USDA identification as part of their Certificate of Veterinary Inspection documentation.
Goats: Goats follow the same scrapie program identification rules as sheep. Sexually intact goats not in slaughter channels of any age that do not meet the requirements to be considered low-risk commercial goats — such as those that are registered, sold for commercial milk production, or sold for other purposes — require official identification. Connecticut also requires that goats exhibited at state fairs originate from Brucellosis and TB-free herds, with goats three months and older testing negative to TB and Brucellosis within 12 months of the show date.
Swine: Swine identification in Connecticut follows federal PIN-based requirements. Current APHIS-approved means of swine identification include official eartags; USDA backtags only when used on swine moving in slaughter channels; official swine tattoos issued and authorized by State or Federal Animal Health Officials on swine moving in slaughter channels; and ear notching if the ear notching has been recorded in the book of record of a purebred registry association. USDA announced a no-cost EID tag program for sow and exhibition swine producers beginning fall 2025; APHIS announced an initiative to provide no-cost EID tags for swine beginning fall 2025, available for sow and exhibition swine producers, who can order tags on the Merck Animal Health website at www.840swinetags.com.
Llamas and Alpacas: Llamas and alpacas that originate within the state must have a CVI issued within 60 days of the first show by an accredited veterinarian listing the permanent identification — ear tag, tattoo, or microchip — and stating the animal is in good health and free of obvious signs of infectious disease. Unlike cattle, there is no mandatory RFID requirement for camelids under the November 2024 federal rule.
Where to Get Official Ear Tags in Connecticut
You have two main routes to obtain official 840 RFID tags in Connecticut: through state distribution programs or directly from USDA-approved manufacturers. Your first step either way is confirming your PIN. Contact the Connecticut Department of Agriculture’s State Veterinarian’s office to register your premises and receive your PIN, or check your existing registration status.
Once you have a PIN, you can order tags from approved manufacturers. Three major manufacturers produce approved 840 tags: Allflex (Dallas, TX), Datamars (Temple, TX), and Y-Tex (Cody, WY). Tags are available through veterinary supply distributors, farm supply stores, and directly from manufacturers. RFID 840 tags cost between $2 and $5 per tag, depending on the manufacturer, tag style, and order quantity (as of early 2026 pricing from industry sources).
Some free tags may also be available. Congress allocated $15 million in the March 2024 Consolidated Appropriations Act specifically for EID tags. Many state veterinarian offices distribute free 840 RFID tags to producers, but supply has been uneven. Contact the Connecticut Department of Agriculture directly to ask whether free RFID tags remain available for the current federal fiscal year. Neighboring states like New York have distributed up to 100 free tags per premises per year while supplies last, so Connecticut may offer a similar allocation.
For sheep and goats, the National Scrapie Eradication Program provides up to 100 plastic flock ID tags free-of-charge to first-time participants in the sheep and goat identification program until available funds are expended. You can also call 1-866-USDA-TAG (873-2824) to request free official sheep and goat serial eartags or get your flock and premises ID numbers assigned. For more on Connecticut’s broader livestock regulations, see our guide to livestock trailer requirements if you are also planning animal transport.
Pro Tip: Allow at least two to three weeks lead time when ordering official tags from manufacturers or requesting them through state programs. Running out of tags the day before a sale or show creates compliance problems that are difficult to fix on short notice.
How and When to Apply Ear Tags in Connecticut
Timing matters as much as tag type. Apply official identification before the animal leaves your property — not at the sale barn or show grounds. Apply the official tag well before movement, such as at processing, preconditioning, or prior to sale or shipment, to avoid delays.
Proper placement protects both the animal and the tag’s long-term readability. Place the tag in the middle third of the ear, between the two cartilage ribs, avoiding blood vessels. Follow brand-specific instructions. Clean the applicator and ear, ensure firm closure, and check retention before animals leave the chute. For young lambs and kids, leave enough space for growth by allowing about one-third of the tag to overhang the edge of the ear.
Use the correct applicator for the tag brand and style you purchase. Use the correct tagger for the brand or model you buy, and match HDX or FDX tag choice to any existing reader or software at your farm or market. HDX (half-duplex) and FDX (full-duplex) are the two low-frequency RFID formats used in official 840 tags — both meet U.S. standards, so your choice should be based on compatibility with the readers already at your operation or the markets you sell through.
If a tag is lost after application, replace it promptly. Non-EID official eartags applied before November 5, 2024 remain valid. 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. Never reuse a tag — ear tags cannot be reused. Each tag has a unique number for one animal only. Reusing tags breaks regulations and causes tracking problems.
Ear Tag Requirements for Interstate Movement in Connecticut
When you move covered livestock out of Connecticut — or receive animals from another state — federal ADT requirements apply in full. While APHIS focuses on interstate movement of livestock, States and Tribal Nations remain responsible for the traceability of livestock within their jurisdictions. This means Connecticut can impose requirements that go beyond the federal baseline, and the receiving state can as well.
For cattle and bison crossing state lines, the rule is straightforward: you must use EID tags for cattle moving between states after November 5, 2024. Animals already carrying valid visual-only tags applied before that date are grandfathered and do not need to be retagged for interstate movement. For any new tag applied after November 5, 2024, it must be an RFID-capable 840 tag — no exceptions for covered animals.
Dairy cattle face an additional layer of federal requirements. Effective April 29, 2024, all lactating dairy cattle are required to receive a negative test for Influenza A virus at an approved National Animal Health Laboratory Network (NAHLN) laboratory for interstate movement. The Connecticut Veterinary Medical Diagnostic Laboratory at UConn is the only approved NAHLN laboratory in New England. Milk samples must be collected and submitted by the same Category II accredited veterinarian completing the health certificate and must be collected no more than seven days prior to interstate movement.
Always verify the destination state’s specific import requirements before you move animals. Always confirm the latest import, exhibition, and interstate movement rules for your destination. Receiving states and exhibition organizers may impose additional requirements. If you regularly move livestock to neighboring states, review our coverage of livestock trailer requirements in Pennsylvania and livestock trailer requirements in New York for transport compliance details that pair with identification requirements. For producers moving animals to the South or Midwest, see guides for states like Georgia, Tennessee, and Missouri.
Recordkeeping Requirements for Ear-Tagged Animals in Connecticut
Applying an official tag is only half the job. Federal regulations require you to maintain records that link each tag number to a specific animal and movement event. Anyone who applies official identification must maintain records. These records are what allow animal health officials to trace a disease event back to its source — and to clear your herd from suspicion if animals you sold or received are involved in an investigation.
For cattle, the core recordkeeping obligation ties to tag distribution and movement. Official ear tags provide animal health officials with a specific starting point from which to trace diseased or potentially diseased animals. The required tag distribution records associate the official identification number with the person that received the device. Without official identification, animal health officials’ ability to accurately trace an animal’s movements can take months or may never be achieved.
For sheep and goats under the National Scrapie Eradication Program, producers are required to follow federal and state regulations for officially identifying their sheep and goats. Producers must also keep herd records showing what new animals were added and what animals left the herd or flock. Specific records you must capture include the date animals were officially identified, the official ID number applied, and the number of identified animals in each movement.
Connecticut’s 2025 fair and show requirements add another recordkeeping layer for exhibited animals. A complete list containing the name of the exhibitor, address, the animal’s official USDA identification — ear tag, tattoo, or microchip — breed, age, and total head count must be made available to the State Livestock Inspector and forwarded to the Connecticut Department of Agriculture, Bureau of Regulatory Services by the fair superintendent. All animals and poultry present on the grounds must be identified on this list.
Important Note: Federal records for cattle must be retained for a minimum of five years. Records for sheep and goats under the scrapie program must be kept for a minimum of five years as well. Keep both paper and digital backups — if records are lost, you may be unable to demonstrate compliance during an inspection or disease investigation.
A straightforward system works well for most small Connecticut operations: record each tag number, the animal’s species and sex, the date of tagging, and any movement dates and destinations in a dedicated logbook or spreadsheet. If you add a new EID tag to an animal that already had a grandfathered visual tag, record both numbers and the date of the new application. For producers who also manage transport compliance, our guides to livestock trailer requirements in Nevada and Oregon cover the transport side of the documentation chain. Connecticut producers with other regulated animals may also find our articles on ferret rabies vaccine requirements in Connecticut and cat rabies vaccine requirements in Connecticut useful for managing their full compliance picture.
When in doubt about any specific requirement, contact the Connecticut Department of Agriculture’s State Veterinarian’s office directly or reach USDA APHIS Veterinary Services at the APHIS Animal Disease Traceability page. Regulations do change, and the state office can confirm current intrastate rules that go beyond what federal guidance covers.