Livestock Microchipping Laws in South Dakota: What Every Producer Needs to Know

If you raise cattle, horses, sheep, or goats in South Dakota, the rules around animal identification have changed significantly — and the stakes for getting it wrong include fines, loss of selling privileges, and animals turned back at state lines. Microchips and RFID ear tags are now central to that system, but the two technologies are not interchangeable for every species or every situation.

This guide breaks down exactly how livestock microchipping fits into South Dakota’s official identification framework, which animals can use a chip as their primary ID, how the federal RFID mandate affects your operation, and what you need to do to register a chip so it counts when it matters most.

Microchipping vs. RFID Ear Tags: What Counts as Official ID in South Dakota

The first thing to understand is that “microchip” and “RFID ear tag” are not the same device, even though both use radio frequency identification technology. An RFID ear tag is an external button-style tag clipped or pierced into the ear. A microchip is an injectable transponder implanted under the skin or into muscle tissue. Both can carry a USDA Animal Identification Number (AIN), but they are approved for different species under federal and South Dakota rules.

Under South Dakota Codified Law 40-3-27, a livestock owner may choose to identify animals using any methods set forth in 9 C.F.R. part 86, as adopted on January 9, 2013, as well as any additional methods later approved by the South Dakota Animal Industry Board. That cross-reference to federal regulations is important: it means South Dakota’s official ID options track directly with what USDA-APHIS approves at the national level.

A USDA rule requiring newly applied cattle and bison official ID tags to have both a visual and electronic component went into effect on November 5, 2024. As of that date, the only official tags meeting those requirements are 840 RFID ear tags. For cattle and bison specifically, an injectable microchip does not satisfy the ear tag requirement — the two are separate devices serving separate regulatory functions.

For other species — horses, sheep, goats, cervids, alpacas, and llamas — an injectable 840 microchip can serve as the primary official identification device. The 840-ID microchip is an officially approved identification device, and the FDA’s Center for Veterinary Medicine has also approved it for use in sheep and goats. The distinction matters: if you run a mixed operation in South Dakota, you may be dealing with both technologies simultaneously depending on the animals involved.

Pro Tip: Do not assume a microchip reader used for companion animals will scan a livestock 840 chip. Livestock 840 microchips operate at 134.2 kHz (ISO standard), which requires an ISO-compatible reader. Confirm your reader’s frequency range before relying on it at a sale barn or state line crossing.

The Federal RFID Mandate and What It Means for South Dakota Producers

USDA’s Animal and Plant Health Inspection Service (APHIS) issued a final rule mandating electronic identification (EID) tags for interstate movement of certain cattle and bison, effective November 5, 2024. The rule requires that sexually intact cattle and bison 18 months and older moving interstate be tagged with electronically readable tags.

Additionally, cattle and bison of any age used for rodeo or recreational events, and cattle and bison of any age used for shows or exhibitions, require electronic tags. Cattle and bison going directly to slaughter are exempted from official identification requirements under the USDA rule.

South Dakota has been one of the most vocal states opposing the mandate. R-CALF USA filed a federal lawsuit challenging the rule, joined by the South Dakota Stockgrowers Association, the Farm and Ranch Freedom Alliance, and individual ranchers. In October 2025, a federal court denied USDA’s motion to dismiss the case, meaning the legal challenge continues. Despite that litigation, the federal RFID rule is in effect as of the publication of this article.

Cattle that already have a silver Brite tag or orange Brucellosis tag in their ear applied before November 2024 are grandfathered into the system for the duration of their lifetime and are not required to get an RFID tag. If you applied those metal tags before the cutoff date, you do not need to retag those specific animals.

South Dakota’s own legislature has pushed back on the federal mandate. The South Dakota legislature passed HB 1096, a livestock identification bill that allowed producers freedom to choose identification forms for their operations. However, that state-level flexibility does not override federal requirements when animals cross state lines — the federal rule governs interstate movement regardless of what South Dakota law permits within its own borders.

Important Note: The R-CALF USA lawsuit against the USDA RFID mandate was still active as of October 2025. A court ruling could modify or strike down the rule. Check with the South Dakota Animal Industry Board or your accredited veterinarian for the latest status before making tagging decisions.

For a broader look at what South Dakota requires when moving animals across state lines, see this guide to transporting livestock laws in South Dakota.

Which Livestock Can Use a Microchip as Official Identification in South Dakota

The answer depends entirely on species. Federal regulations under 9 CFR Part 86, which South Dakota adopts by reference, draw a clear line between cattle/bison (ear tag required) and other livestock (injectable microchip permitted).

The 840-ID official microchip can be used in all equines, goats, sheep, alpacas, llamas, elk, whitetail and other deer, and similar livestock. For these animals, an implanted 840 chip satisfies the official identification requirement when it is properly registered and accompanied by the correct documentation during movement.

Cattle and bison are a different story. The RFID ear tag changes apply only to official ID for cattle and bison. An injectable microchip in a cow or steer does not replace the ear tag requirement for interstate movement. You can implant a chip for your own herd management records, but it will not appear on a Certificate of Veterinary Inspection (CVI) as official ID for that animal.

Here is a quick-reference breakdown of species and their primary official ID options in South Dakota:

Species	Primary Official ID for Interstate Movement	Injectable Microchip Qualifies?
Cattle & Bison	840 RFID ear tag (applied after Nov. 5, 2024)	No — ear tag required
Horses & Equines	840 injectable microchip or RFID tag	Yes
Sheep & Goats	840 RFID tag or approved injectable chip + Scrapie Flock ID	Yes, with conditions
Cervids (Deer, Elk)	840 injectable microchip or RFID tag	Yes
Alpacas & Llamas	840 injectable microchip or RFID tag	Yes
Swine	Group/lot ID or individual 840 tag per 9 CFR 86	Limited — check with SD AIB

If you raise goats in South Dakota, note that the microchip requirement comes with an extra layer. For goats and sheep, you must have both a Premises ID Number and a Flock (Scrapie) ID Number before ordering 840 microchips. You can get your Scrapie Flock ID by calling 1-866-USDA-TAG. For more on South Dakota goat ownership rules, see goat ownership laws in South Dakota.

When a Microchip Qualifies for Interstate Movement in South Dakota

A microchip only counts as official identification during interstate movement when several conditions are met simultaneously. Meeting just one or two of them is not enough — all requirements must be satisfied before the animal leaves the state.

For equines, cervids, alpacas, and llamas, the chip must carry an 840 AIN, be implanted in the approved anatomical location for that species, and be readable with an ISO-compatible scanner. All livestock entering South Dakota must have an official Certificate of Veterinary Inspection (CVI) stating the name, address, and phone number of the consignor; name and address of the point of origination if different from the consignor; and the name, physical address, and phone number of the consignee. The microchip number must appear on that CVI as the individual official identification.

For sheep and goats moving with a microchip as official ID, the rules are stricter. An electronic implantable device (EID) qualifies when the animal is accompanied by a reader and a copy of the registration certificate that includes the EID number in the current owner’s name, or if not in the current owner’s name, a copy of the registration certificate and a completed transfer of ownership form dated within 30 days of the movement, or a CVI listing the registry, EID number, and flock of origin owner name and address.

In practical terms, this means you need three things ready before loading sheep or goats for interstate transport with a microchip as ID: a working ISO reader, the registration paperwork tied to the chip number, and a CVI issued by an accredited veterinarian. Missing any one of these can result in the animals being turned back at the destination state.

Pro Tip: South Dakota’s Animal Industry Board accepts CVIs issued through approved electronic systems including GlobalVetLink, VSPS, VetSentry, and Sale Time Systems. No import permit is required on CVIs issued for domestic livestock using those approved electronic systems. Using one of these platforms can streamline the paperwork significantly.

If you are moving livestock into or out of neighboring states, the receiving state’s rules also apply. See this companion guide on transporting livestock laws in North Dakota for comparison.

Approved Microchip Standards and Placement by Species in South Dakota

Not every microchip on the market qualifies as official USDA identification. The chip must be an approved 840 AIN device manufactured by a USDA-APHIS-authorized vendor and encoded with a 15-digit number beginning with the United States country code 840.

Each chip begins with the United States country code “840,” making it fully compliant with USDA-APHIS and Scrapie regulations. Designed to last a lifetime, this microchip never needs replacing and provides reliable, readable identification. The chip must also operate at 134.2 kHz per ISO 11784/11785 standards to be readable by standard livestock scanners. The transponder must conform to ISO 11784 and ISO 11785; if materials testing was conducted at another laboratory, equivalent results may be considered.

Placement locations vary by species and are set by APHIS-approved protocols:

• Horses and equines: Left side of the neck, midway between the poll and withers, in the nuchal ligament. This is the international standard placement recognized across breed registries.
• Sheep and goats: Subcutaneous in the left ear or the tail-fold area, depending on the approved device and breed registry requirements.
• Deer, elk, and cervids: Base of the left ear or neck muscle, depending on the approved device listing from the APHIS official AIN device guide.
• Alpacas and llamas: Left side of the neck, similar to equine placement.

Placement by an accredited veterinarian is strongly recommended — and in some cases required — to ensure the chip is seated correctly, the implant is recorded on a CVI or health certificate, and the procedure is documented in a way that satisfies both state and federal traceability requirements. In 2015, USDA approved 840-encoded microchips for official USDA identification to comply with USDA and APHIS regulations.

Some 840 microchips use a 15-gauge needle — smaller than traditional options — resulting in less stress during implantation without sacrificing scan performance. Ask your veterinarian about mini-chip options if you work with smaller animals or animals prone to stress during handling.

Registering a Livestock Microchip in South Dakota

Implanting the chip is only half the job. A chip that is not registered to a premises and owner provides almost no traceability value — and in a disease outbreak or theft situation, an unregistered chip will not help you prove ownership or trace your animals quickly.

The registration process in South Dakota runs through two parallel systems: the USDA Premises Identification Number (PIN) system and, for sheep and goats, the USDA Scrapie Flock ID system.

1. Obtain a Premises Identification Number (PIN): Contact the South Dakota Animal Industry Board (SD AIB) at aib.sd.gov or call their office to register your premises. Horses, deer, elk, alpacas, llamas, and other livestock must have a Premises ID Number before ordering 840 microchips. Your PIN ties the chip number to a physical location, which is the foundation of the traceability system.
2. Obtain a Scrapie Flock ID (sheep and goats only): Goats and sheep require both a Premises ID Number and a Flock (Scrapie) ID Number. Call 1-866-USDA-TAG to get your Flock ID assigned. 840 microchip orders cannot ship until Flock and/or Premises IDs are verified.
3. Order USDA-approved 840 chips: Purchase chips only from APHIS-authorized vendors. The chip number must begin with 840 and be encoded by the manufacturer through APHIS’s Animal Identification Management System (AIMS). AIMS is a web-based program used to administer official animal identification numbers and devices; all distribution records for AIN devices are maintained on AIMS.
4. Have the chip implanted and documented: Record the chip number, implant date, species, breed, sex, and age in your herd records. If an accredited veterinarian performs the implant, ensure the chip number appears on any health certificates or CVIs issued for that animal going forward.
5. Maintain records: Anyone who applies official identification must maintain records. Keep implant records on file and accessible. In a disease investigation or theft claim, you will need to produce documentation quickly.

Producers can receive a Premises ID number to register their RFID tags or chips. You are not required to buy any electronic tag readers or software unless you want them for easier record keeping and herd management. That said, having your own ISO reader on hand saves time at sale barns and during veterinary inspections.

For related South Dakota animal import and vaccination documentation requirements, see pet import laws in South Dakota and pet vaccination laws in South Dakota.

Microchipping as Proof of Ownership in South Dakota

South Dakota is a brand-inspection state, and the brand system remains the primary legal mechanism for proving cattle ownership. The South Dakota Animal Industry Board may not develop and implement any identification program that conflicts with or supersedes any provision of the state brand laws. This means a microchip — even a properly registered 840 chip — does not replace a recorded brand as proof of cattle ownership in South Dakota.

For species that are not typically branded — horses, sheep, goats, deer, alpacas — a registered microchip carries significantly more legal weight as an ownership identifier. Because the chip number is tied to your PIN and owner records in the AIMS database, it creates a documented chain of custody that a bill of sale alone cannot provide.

Here is how microchip evidence functions across different ownership scenarios in South Dakota:

Scenario	Does a Microchip Help Prove Ownership?	Additional Documentation Needed
Cattle theft or straying	Supplemental only — brand inspection is primary	Brand registration, bill of sale
Horse theft or dispute	Yes — chip + registration is strong evidence	Registration certificate, CVI records
Sheep/goat theft	Yes — chip + Scrapie Flock ID records	Flock ID paperwork, purchase records
Interstate ownership transfer	Yes — chip number on CVI documents transfer	Signed CVI from accredited vet
Natural disaster animal recovery	Yes — chip is permanent and scannable	Premises ID registration records

Beyond practical everyday use, livestock microchips have been put to work for prevention of livestock theft, natural disaster recovery of livestock, and recovery of stolen animals. In South Dakota, where blizzards and flooding can scatter livestock across county lines, having a permanent, scannable ID that ties back to your registered premises is a practical safeguard that a paper brand certificate cannot replicate in the field.

If you are dealing with a neighbor’s animals straying onto your property, the chip registration system can also help identify the owner quickly. See how South Dakota handles those situations in this guide to open range laws in South Dakota.

For producers who move animals frequently to shows, exhibitions, or sale barns, a microchip provides a permanent ID that cannot fall out of an ear or be switched between animals — a real-world advantage over ear tags alone. An average of 12% of ear tags are lost per year, according to South Dakota Stockgrowers Association data, which underscores why many producers use both a chip and an ear tag as a redundancy strategy rather than relying on either alone.

For more on South Dakota’s livestock trailer and transport rules that intersect with identification requirements, see livestock trailer requirements in South Dakota. If you raise backyard poultry alongside your livestock operation, check the rules at backyard chicken laws in South Dakota as well.

Key Takeaway: A registered 840 microchip is a permanent, tamper-resistant identification tool that strengthens your ownership records, supports interstate movement documentation, and provides a last line of defense in theft and disaster recovery situations — but it works best when paired with proper premises registration, current CVIs, and species-appropriate documentation. Contact the South Dakota Animal Industry Board to start your premises registration before ordering chips.