Livestock Microchipping Laws in Texas: What Producers Need to Know

If you raise cattle, goats, sheep, horses, or exotic livestock in Texas, understanding the difference between a microchip and an RFID ear tag — and knowing exactly when each one qualifies as official identification — can save you from compliance headaches at the state line or the sale barn.

Texas livestock identification sits at the intersection of state rules administered by the Texas Animal Health Commission (TAHC) and federal regulations enforced by USDA’s Animal and Plant Health Inspection Service (APHIS). The two systems overlap but are not identical, and the species you raise largely determines which device you need and when.

This guide walks through every layer of those rules — from the federal RFID mandate that took effect in November 2024 to the narrow but real scenarios where an injectable microchip stands as valid official identification for Texas livestock.

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

The terms “microchip” and “RFID tag” both describe radio-frequency identification technology, but they are not interchangeable under Texas and federal livestock law. An RFID ear tag is an external device clipped to the animal’s ear, while a microchip (also called an injectable transponder) is implanted under the skin or into a specific anatomical site.

For most cattle and bison, the ear tag is the required form of official electronic identification. Official EID devices are USDA-approved tags that carry 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.” A standard pet-style microchip — even one that reads an 840-prefix number — does not meet this definition for cattle and bison.

For other species, the picture changes. For ratites entering Texas, official identification may be satisfied by an RFID device, a permanently attached tag, or an implanted electronic device (microchip). Similarly, USDA’s approved device list includes injectable 840-prefix transponders for equine, deer, elk, sheep, and goats — species for which an ear tag is not always the only path to compliance.

Pro Tip: Before purchasing any microchip or RFID device, verify it appears on the USDA APHIS official AIN device list. An 840-prefix number alone does not make a device “official” — it must be a USDA-approved product from an approved manufacturer.

Official identification is fundamental to traceability and animal disease programs. Cattle, sheep, goats, swine, and other livestock are subject to official identification requirements as outlined by USDA and TAHC regulations. When in doubt about which device applies to your operation, producers are encouraged to contact their veterinarian or TAHC to determine which method of tagging will work best for their operation.

The Federal RFID Mandate and What It Means for Texas Producers

The single biggest shift in livestock identification law in recent years came from the federal level. The USDA published a final rule in the Federal Register on May 9, 2024, and the rule enhancing traceability took effect beginning November 5, 2024. For Texas ranchers moving covered cattle and bison across state lines, that date is the compliance baseline.

The final rule requires ear tags that are both visually and electronically readable for interstate movement of certain bison and cattle. This means the old silver metal “brite” tags and plain plastic visual tags no longer qualify as official identification for newly tagged animals. Visual-only identification devices placed in cattle and bison after November 5, 2024, are not considered official.

There is an important grandfather provision. A producer is not required to re-tag animals that were tagged with non-electronically readable tags prior to that date — the non-electronic tags already in place are considered official for the lifetime of the animal. Going forward, however, electronic tags are required when tagging applicable animals. The final rule applies to intact cattle and bison 18 months of age or older, all dairy cattle, cattle and bison of any age used for rodeo or recreation events, and cattle or bison of any age used for shows or exhibitions.

Texas producers can obtain no-cost RFID ear tags to ease the transition. The TAHC received a limited number of no-cost RFID ear tags from the USDA to distribute to Texans for use in replacement breeding cattle, intended to be used in lieu of the silver metal “bright” tags and orange metal Official Calfhood Vaccination (OCV) tags. Texas accredited veterinarians and ranchers interested in ordering RFID tags at no cost may submit their request to the TAHC Animal Disease Traceability (ADT) Department; tags are ordered in bags of 100 and are made available for pick up at TAHC region offices.

Important Note: The November 2024 EID mandate applies specifically to cattle and bison moving in interstate commerce under the ADT rule. It does not, as of the publication of this article, extend the same mandatory EID ear-tag requirement to sheep, goats, swine, horses, or poultry — those species remain subject to their own separate identification frameworks.

If you move livestock between Texas and other states regularly, also review the livestock transportation laws in Texas for a broader look at movement documentation requirements.

Which Livestock Can Use a Microchip as Official Identification in Texas

The species question matters enormously here. Cattle and bison covered by the ADT rule must use approved RFID ear tags — not injectable microchips — as their official identification device for interstate movement purposes. For those animals, a microchip is a supplemental tool, not a substitute for the required ear tag.

For other species, injectable 840-prefix microchips are explicitly listed as approved official AIN devices. The 840-ID official microchip can be used in all equines, goats, sheep, alpaca, llama, elk, whitetail and other deer, and similar species. These devices carry the same 15-digit 840-prefix number format as ear tags and feed into the same national traceability database.

Sheep and goats in Texas also fall under the National Scrapie Eradication Program (NSEP). The NSEP rules state that official individual ID — which includes an official ear tag, registry or flock ID tattoo, or official electronic implantable ID — is required for goats in interstate commerce moving for purposes other than slaughter or feeding for slaughter. That phrase “official electronic implantable ID” is the regulatory hook that makes a properly registered microchip a valid option for goats and sheep crossing state lines.

For exotic livestock and ratites entering Texas, the TAHC’s own movement requirements confirm that an implanted electronic device (microchip) satisfies the official identification requirement. Texas ranchers raising goats or pigs should confirm species-specific rules with TAHC before assuming a microchip alone covers all movement scenarios.

Species	Microchip Qualifies as Official ID?	Primary Requirement
Cattle & Bison (ADT-covered)	No — ear tag required	RFID ear tag (840-prefix, EID-readable)
Horses / Equine	Yes — approved injectable transponder	840-prefix injectable microchip or ear tag
Sheep & Goats	Yes — official electronic implantable ID	Official ear tag or approved microchip + flock ID
Deer & Elk	Yes — approved injectable transponder	840-prefix injectable microchip
Ratites (Ostrich, Emu, etc.)	Yes — implanted electronic device accepted	RFID device, permanent tag, or microchip
Alpaca / Llama	Yes — approved injectable transponder	840-prefix injectable microchip

When a Microchip Qualifies for Interstate Movement in Texas

Getting your livestock across a state line legally requires more than just having a chip in the animal. The microchip must be an approved 840-prefix device, it must be registered to a valid Premises Identification Number (PIN) or Location Identification Number (LID), and the movement must be accompanied by the correct documentation.

The ADT program requires that for certain animals moving in interstate commerce, an interstate certificate of veterinary inspection (“health certificate”) and official identification must accompany the animal. That health certificate — often called a CVI — is issued by an accredited veterinarian and must reference the animal’s official ID number, whether that number comes from an ear tag or a microchip.

For sheep and goats specifically, animals being shipped across state lines always require official identification and an Interstate Certificate of Veterinary Inspection (ICVI), and most of the time these ICVIs will require a Flock Identification Number and/or a Premises Identification Number.

There are also movement exceptions worth knowing. Exceptions apply for animals crossing state lines to go directly to an approved tagging site such as a livestock auction, for animals moved directly to slaughter or through no more than one USDA-approved livestock facility, and for commuter herds that travel between premises owned by the same person or entity in two different states.

Texas also updated its entry documentation rules. As of January 1, 2026, all import certificates of veterinary inspection (CVIs) must be electronic. If you are bringing microchipped livestock into Texas from another state, your accredited vet must issue an electronic CVI, not a paper one. For more on what Texas requires when animals cross its borders, see the Texas pet and animal import laws page for related context.

Pro Tip: Use the Interstate Livestock tool at interstatelivestock.com to look up exactly what documentation your destination state requires by species. Requirements vary significantly — a microchip that satisfies Texas may not satisfy the receiving state’s entry rules.

Approved Microchip Standards and Placement by Species in Texas

Not every injectable RFID transponder on the market qualifies as official identification. USDA APHIS maintains an approved AIN device list, and only devices on that list — carrying an 840-prefix 15-digit number — count toward official traceability requirements.

The format is consistent across all species: an example of the correct 840-prefix format looks like 840123456000777. The number must be unique to the individual animal and traceable back through the national Animal Identification Management System (AIMS) database to your registered premises.

Placement standards differ by species and are set by USDA APHIS in coordination with the manufacturer. For equine, the standard site is the nuchal ligament of the neck — typically on the left side of the crest. For sheep and goats, injectable transponders are generally placed in the left ear, the tail web, or the base of the ear depending on the approved device protocol. For deer and elk, neck placement is common. Always follow the specific placement instructions that come with the approved device, as improper placement can affect readability and may not satisfy an inspector.

The microchip is permanent, tamperproof, and can be quickly read by a handheld reader or scanner, making it a favored form of ID for tracking horses, alpacas, llamas, deer, buffalo, and goats as well as other species. For cattle and sheep where a longer read distance is preferred, a rumen bolus is a good choice — it is swallowed and stays in the rumen for the life of the animal. A bolus carrying an 840-prefix AIN can serve as official identification for cattle when it appears on the approved device list, though it is far less common than the ear tag for cattle in Texas.

Texas ranchers raising backyard chickens or other poultry should note that poultry identification operates under a separate flock-based framework — see the backyard chicken laws in Texas for that species-specific guidance.

Registering a Livestock Microchip in Texas

Purchasing an approved 840-prefix microchip is only the first step. Before the chip can be ordered or activated as official identification, your operation must have a registered premises or location identifier on file with TAHC and USDA.

A national Premises Identification Number (PIN) is a unique number permanently assigned to a physical address where livestock animals are located, with all owner and premises information stored in a federal database. Texas uses the USDA APHIS Premises Management System to obtain a PIN from the federal allocator.

Texas also offers a state-level alternative. Texas has a state system for issuing a Location Identifier (LID), which is a unique number permanently assigned to an owner’s contact and operation information — not a specific premises — and stored in a state-administered database. The information collected is not shared with the federal system; only the LID number is reported to the federal system as a valid number.

For sheep and goat producers, an additional registration layer applies. A scrapie flock identification number is a unique number permanently assigned to a group of animals managed as a unit on one or more premises and under the same ownership. The scrapie flock ID number must be recorded in and linked to one or more PINs or LIDs in the National Scrapie Database to obtain 840 tags or microchips.

Here is a step-by-step summary of the registration process for Texas livestock producers:

1. Register your premises with TAHC to obtain a PIN or LID. Contact the TAHC ADT Department at [email protected] or call 512-719-0733.
2. If you raise sheep or goats, also obtain a scrapie flock ID number by calling 1-866-873-2824 or emailing TAHC.
3. Order 840-prefix official microchips from an approved manufacturer or distributor, providing your PIN, LID, and (if applicable) scrapie flock ID at the time of order.
4. Have an accredited veterinarian implant the device using the species-appropriate placement protocol.
5. Record the chip number against the animal in your herd records and ensure your CVI references the chip number for any interstate movement.

For goats and sheep, you must have both a Premises ID Number and a Flock (Scrapie) ID Number before ordering microchips. To get your Premises ID, contact your state-specific Animal Health Office or call your state veterinarian’s office.

Pro Tip: Texas offers free RFID ear tags through TAHC for replacement breeding cattle — but no equivalent free microchip program exists for other species. Budget for the cost of approved injectable transponders when planning your identification system for horses, goats, or deer.

Microchipping as Proof of Ownership in Texas

Beyond disease traceability, a microchip can play a meaningful role in livestock ownership disputes in Texas — but it works differently from the brand and mark system that has governed Texas livestock ownership for generations.

Texas brands and earmarks remain the primary legal proof of ownership for cattle, horses, hogs, sheep, and goats under state law. Senate Bill 503, passed during the 89th Texas Legislative Session (2025) and signed by the governor, amends sections of Chapter 144 of the Texas Agriculture Code to establish a more modernized and streamlined system for livestock identification through the use of a digital, centralized brand registry. The effective date of this act began September 1, 2025, and requires TAHC, as soon as practicable after the effective date, to adopt the rules necessary to implement the changes.

Critically, that same legislation expanded what counts as a recognized identifier. The act expands the acceptable forms of livestock identification beyond traditional methods — such as brands, earmarks, and tattoos — to include electronic devices and other generally accepted identification technologies. This means a properly registered microchip can now be part of the legal identification record for a Texas livestock animal under state law, not just a federal traceability tool.

With the electronic filing system housed at the Texas Animal Health Commission, law enforcement, producers, and county clerks can access it online. The centralized database allows for quicker identification of stray or stolen livestock, reducing the need to hold animals for extended periods and expediting the return of livestock to their rightful owner.

In practical terms, a microchip strengthens your ownership claim when combined with a registered brand or earmark — but it is not a standalone replacement for those traditional marks under current Texas law. If your animal is stolen or strays, having a chip number that traces back to your registered PIN or LID gives law enforcement and animal health officials a clear electronic record linking the animal to your operation.

Producers raising animals that are sometimes treated more like companion animals — such as show pigs or pet goats — may find that microchipping also aligns with the broader animal identification practices covered under Texas pet laws. For rooster and poultry owners navigating identification in an urban or semi-rural context, the rooster laws in Texas page covers additional relevant local rules.

If a dispute does arise over livestock ownership, Texas law enforcement will look at the totality of identification evidence — brands recorded with the county clerk, TAHC registration records, microchip database entries, and purchase documentation. Keeping all of these in sync is the most defensible position a Texas producer can take.

For producers who transport animals regularly, pairing a solid identification system with a clear understanding of Texas livestock transportation rules is the most practical way to stay compliant from the pasture gate to the sale barn and across state lines.