Livestock Microchipping Laws in Maryland: What Producers Need to Know

If you raise cattle, sheep, goats, horses, or swine in Maryland, understanding the difference between a microchip implant and an RFID ear tag — and when each one satisfies the law — can save you from a failed inspection or a blocked interstate shipment. The rules have tightened considerably since 2024, and Maryland producers now operate under a layered framework of state and federal identification requirements that are not always self-explanatory.

This guide walks you through exactly what Maryland recognizes as official livestock identification, where microchips fit into that picture, which species can use them, and what you must do before a chip number carries any legal weight. Whether you run a small hobby farm or a commercial operation, the steps outlined here apply directly to your situation.

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

The terms “microchip” and “RFID” are often used interchangeably, but they describe different physical forms of the same underlying radio-frequency technology. A livestock microchip is a biocompatible capsule — roughly the size and shape of a grain of rice — that houses a small radio-frequency identification (RFID) chip. An RFID ear tag, by contrast, is an external device clipped to the animal’s ear. Both transmit a unique ID number when scanned, but they are treated differently under Maryland and federal rules.

The Maryland Department of Agriculture (MDA) provides free metal official identification tags to producers upon request, and the federal government issued final regulations requiring most animals moving interstate — unless going directly to slaughter — to have official identification. For cattle and bison specifically, that official identification must now be an RFID ear tag, not an implanted microchip. 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, and currently the only official tags that meet these requirements are 840 RFID ear tags.

For sheep, goats, and equines, the picture is different. The 840-ID Official Microchip can be used in all equines, goats, sheep, alpaca, llama, elk, whitetail and other deer, and similar species. In Maryland, a microchip ID with official scrapie identification is acceptable for sheep if the owner provides the reader. The same standard applies to goats under Maryland’s fair and show requirements. The takeaway: a microchip can serve as official ID for small ruminants and equines in Maryland, but it is not a substitute for an 840 RFID ear tag when it comes to cattle and bison.

Pro Tip: If you use a microchip as official ID for sheep or goats at a Maryland fair or show, bring your own compatible scanner. Maryland does not require event organizers to supply readers for implanted devices.

The Federal RFID Mandate and What It Means for Maryland Producers

The federal Animal Disease Traceability (ADT) program, first established in 2013, has been the backbone of interstate livestock identification requirements for over a decade. The 2013 ADT rule requires that all dairy cattle and adult beef cattle that cross state lines have some form of “official identification,” and the rule specifically provides that people can use either electronic or traditional forms of ID. That flexibility for cattle ended with the 2024 update.

The updated Animal Disease Traceability regulations, effective November 5, 2024, aim to enhance the nation’s ability to respond to and mitigate the impact of foreign or significant diseases affecting livestock, and cattle tags applied after November 5, 2024, must be both visually and electronically readable (RFID). For Maryland cattle producers, this means any new official tag placed on an animal — whether for interstate movement, brucellosis vaccination, or tuberculosis testing — must be an 840 RFID ear tag.

The types of cattle required to be identified when moving interstate remain unchanged: the list includes dairy cattle, sexually intact beef cattle 18 months or older, and rodeo and exhibition cattle. Cattle and bison are exempted from official identification requirements if they are going directly to slaughter. Grandfathering provisions also apply: official metal tags that conform to the National Uniform Eartagging System and were applied before the November 5, 2024, deadline will continue to be accepted.

The USDA has documented that electronically recorded ID and movement data can drastically reduce the time needed to locate an animal among millions of data points to under an hour, compared to paper records that can delay a trace by days or weeks. For Maryland producers near state borders — particularly those moving cattle into Delaware, Virginia, or Pennsylvania — understanding this rule is not optional.

Important Note: The 2024 RFID mandate applies only to cattle and bison. Swine, sheep, goats, and equines operate under separate federal identification programs with different approved device lists, detailed in the sections below.

Which Livestock Can Use a Microchip as Official Identification in Maryland

Not every species on your Maryland farm is subject to the same identification rules. The table below summarizes which animals can use an implanted microchip as official identification and under what conditions.

Species	Microchip Accepted as Official ID?	Conditions
Cattle & Bison	No (for interstate movement)	840 RFID ear tag required for tags applied after Nov. 5, 2024
Sheep	Yes (with restrictions)	Must be paired with official scrapie ID; owner must supply reader
Goats	Yes (with restrictions)	Must be paired with official scrapie ID; owner must supply reader
Equines (horses, mules, donkeys)	Yes	ISO-compliant 840 microchip; premises ID required to order
Swine	Generally no for official ID	RFID ear tags required; Maryland exhibitions require RFID ear tags for swine
Alpacas & Llamas	Yes	840 microchip accepted; premises ID required

RFID tags are now required for cattle and swine shown at Maryland exhibitions. For sheep and goats at Maryland fairs and shows, all sheep must be officially scrapie-identified, and official identification options include legible registration tattoos for which the breed registration paper contains the registry premises or flock tattoo prefix linked to the APHIS-assigned PIN and flock ID number. A microchip rounds out the acceptable options for small ruminants when paired with a valid scrapie identification number.

If you raise goats in Maryland, the scrapie ID requirement applies to every animal leaving your property, regardless of whether you use a tag, tattoo, or microchip as the primary identification device.

When a Microchip Qualifies for Interstate Movement in Maryland

Moving livestock across state lines triggers federal identification requirements, and the device in your animal’s ear or tissue must match what the receiving state and USDA accept. For equines, alpacas, llamas, sheep, and goats, an 840-series implantable microchip can satisfy the official ID requirement for interstate movement — but only when it is properly registered and accompanied by the correct paperwork.

The federal government’s final regulations require most animals moving interstate, unless going directly to slaughter, to have official identification. For sheep and goats, that means scrapie identification must be in place before the animal leaves the farm. 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, and 840 microchips are listed among the approved implantable devices under the same program.

For equines, an ISO-compliant microchip has long been accepted for interstate movement documentation. The AVMA’s policy states that implantation of microchips is a veterinary procedure that should be performed by a licensed veterinarian or under the supervision of a licensed veterinarian. Maryland follows this standard, meaning the chip must be placed by or under the supervision of an accredited veterinarian to carry weight on a Certificate of Veterinary Inspection (CVI).

For cattle moving out of Maryland, the microchip is not a standalone solution. USDA’s final rule amends the animal disease traceability regulations to require that ear tags applied on or after a date 180 days after publication of the final rule be both visually and electronically readable in order to be recognized for use as official ear tags for interstate movement of cattle and bison. Implanted microchips do not satisfy this requirement for cattle, regardless of the chip’s 840-series number.

If you transport livestock across state lines from Maryland, reviewing the livestock transport laws in North Carolina, Georgia, or other destination states is equally important, since receiving states may impose additional identification or health certificate requirements beyond the federal baseline.

Pro Tip: Always confirm the receiving state’s import requirements before loading. Maryland’s MDA Animal Health division can be reached at 410-841-5810 to verify whether your animal’s identification method will be accepted at the destination.

Approved Microchip Standards and Placement by Species in Maryland

Not every microchip on the market qualifies as official identification. USDA APHIS maintains an approved device list, and only chips that meet specific technical and numbering standards can be used for official purposes in Maryland.

The “840” chips are used for official USDA identification to comply with USDA-APHIS and Scrapie regulations. Approved tags and devices must be tamper-resistant, have a high retention rate of at least 99%, and start with the three numbers 840 — the ISO code for the United States. Any chip beginning with a different country code or using a non-approved frequency does not qualify as official identification in Maryland or anywhere else in the U.S.

Placement standards vary by species. The key approved placements recognized under USDA APHIS guidelines are:

• Horses, mules, and donkeys: Typically implanted in the nuchal ligament of the neck (left side), following ISO 11784/11785 standards
• Sheep and goats: Implanted subcutaneously, with restrictions on site noted in the National Scrapie Eradication Program Standards; there are restrictions on the use of implantable devices for sheep and goats — refer to page 55 of the National Scrapie Eradication Program Standards
• Alpacas and llamas: Typically in the left side of the neck or the base of the left ear, following the same 840-series requirement
• Cattle (non-official use only): Microchips can be implanted for farm management or proof of ownership purposes, but do not substitute for the required 840 RFID ear tag for official interstate ID

The 840-ID Microchip is an officially approved microchip, and the FDA’s Center for Veterinary Medicine also approved the 840-ID Microchip for use in sheep and goats. When ordering these devices, your premises identification number must be verified before the order ships. A national premises ID is required to purchase official 840 RFID tags or implantable devices.

There is no agreed “American standard” for microchip frequencies, but the American National Standards Institute (ANSI) voted in favor of the current International Standards Organization (ISO) standards both at the time of initial adoption in 1996 and at the time of their mandatory five-year reviews. For Maryland producers, this means sticking with ISO-compliant 840-series chips from USDA APHIS-approved manufacturers is the only path to official recognition.

Registering a Livestock Microchip in Maryland

Implanting a chip is only half the process. Until the chip number is linked to a registered premises and, where required, a flock or scrapie ID, it has no official standing under Maryland or federal law. Registration is the step most producers skip — and the one that most often causes problems at auction barns, state borders, and veterinary inspections.

The registration process in Maryland follows these steps:

1. Register your premises with the Maryland Department of Agriculture. Premises registration is key to responding to and minimizing the impact of an animal disease outbreak, and the first step in implementing an animal identification system is identifying and registering premises where livestock is congregated. You can register by calling MDA at 410-841-5810 or by submitting the Premises Registration Form at mda.maryland.gov. You will receive a Premises Identification Number (PIN).
2. Obtain a Scrapie Flock ID if you raise sheep or goats. For horses, deer, elk, alpacas, llamas, and other livestock, a Premises ID Number is required; for goats and sheep, you must have both a Premises ID Number and a Flock (Scrapie) ID Number. Call 1-866-USDA-TAG (866-873-2824) to obtain your flock ID.
3. Order 840-series microchips from an approved manufacturer. 840 microchip orders cannot ship until flock and/or premises IDs are verified. Approved manufacturers include companies listed on the USDA APHIS AIN device list.
4. Have the chip implanted by an accredited veterinarian. The chip number must be recorded on any Certificate of Veterinary Inspection (CVI) issued for the animal. Official identification must be applied prior to exhibition. The same principle applies before any interstate movement.
5. Record the chip number in your herd records. Be sure to keep records of tags applied. Under Maryland Code of Maryland Regulations (COMAR), livestock dealers and market operators must maintain records covering all animals received and disposed of, including each animal’s identification number.

Exhibitors may register their farm and obtain a premises identification number by contacting the Maryland Department of Agriculture by phone at 410-841-5810 or by email at animalhealth.mda@maryland.gov. If you have questions about whether your specific chip model qualifies, MDA’s Animal Health division can confirm approval status before you order.

If you also keep backyard chickens or other small livestock, Maryland maintains separate identification and permitting frameworks. See the state’s rules on backyard chickens in Maryland for a parallel overview of how animal identification intersects with local ordinances.

Microchipping as Proof of Ownership in Maryland

Beyond disease traceability, a registered microchip is one of the strongest tools available to Maryland livestock owners for establishing proof of ownership in a dispute, theft case, or insurance claim. Unlike ear tags, which can be removed, microchipping is a safe, permanent, and highly effective form of tagging or branding your animals, and a microchip implanted in each animal on your farm provides a permanent form of identification and proof of ownership.

Maryland law recognizes multiple forms of livestock identification for ownership purposes, including ear tags, tattoos, brands, and microchips. Each animal shall be identified by a metal ear tag number, tattoo number, purebred name and registry number, or a horn or hoof brand number, by breed, sex, age, and approximate weight, the health status, and the purpose for which the animals are consigned. A microchip number can supplement this record and, when linked to a registered premises ID in the USDA’s Animal Identification Management System (AIMS), creates a timestamped chain of custody that is difficult to challenge.

In theft or recovery situations, a microchip provides a layer of protection that physical tags cannot. Identification tags are effective means of identification only if they are in place on the animal when it becomes lost, and ear tags are effective and visible means of identification but can be removed intentionally or by trauma. A chip embedded in tissue cannot be removed without veterinary intervention, making it the most tamper-resistant form of identification available to Maryland producers.

For ownership records to hold up legally, the chip number must appear on:

• Your premises registration records with MDA
• The animal’s veterinary records, including the CVI if the animal has moved interstate
• Any bill of sale, breed registration papers, or insurance documentation
• Your AIMS records if the chip is an 840-series official device

RFID technology enables accurate and automated identification of individual animals, reducing the risk of errors associated with manual record-keeping, and RFID ear tags and microchips allow for rapid and non-invasive identification of animals, saving time and labor during tasks such as herd management, health monitoring, and sales transactions. When both a microchip and an RFID ear tag are in place — as recommended for cattle — you have redundant identification that satisfies official requirements and protects your ownership claim simultaneously.

Maryland producers who also keep companion animals or other regulated species should be aware that identification and ownership documentation requirements vary across animal categories. For context on how Maryland handles other regulated animals, see the state’s rules on hedgehog ownership, pit bull laws, and rooster laws in Maryland.

Keeping your microchip records current, your premises registration active, and your chip numbers documented across all relevant paperwork is the most practical step you can take to protect your livestock investment in Maryland — whether you are moving animals across state lines, showing at a county fair, or simply building a defensible ownership record for your herd.