Swine Ear Notching Laws in North Carolina: What Every Pig Owner Needs to Know

North Carolina is one of the country’s most active pork-producing states, and whether you raise a single sow or manage a commercial herd, understanding how swine identification works under state law is non-negotiable. Ear notching sits at the intersection of farm management tradition and regulatory compliance — get it wrong, and you may face civil penalties or have your animals presumed feral under state statute.

This guide walks you through exactly when ear notching satisfies North Carolina’s official ID requirements, how the 1-3-9 notching system works, what purebred registries expect, and how notching stacks up against ear tags, tattoos, and RFID technology. If you also raise other livestock or keep backyard animals, you may want to review North Carolina’s goat ownership laws and livestock transportation rules, which often intersect with swine identification requirements.

What Is Swine Ear Notching and When It Is Used in North Carolina

Ear notching is a form of permanent identification used in the swine industry. It involves making small, V-shaped notches at specific locations on a piglet’s ears using special ear notching pliers. The resulting pattern encodes both the litter number and the individual pig’s number within that litter, giving each animal a unique, readable identity that requires no tag hardware and cannot fall off.

The simplest method and the one recommended by most breed associations is ear notching, and the most common notching system is the 1-3-9 system. North Carolina producers use it across commercial, purebred, and 4-H show settings alike. The method is especially practical at farrowing time because it can be performed on newborns during the same handling session as tail docking and navel care.

Preferably, pigs are notched during their first week of life. Notching young piglets reduces stress, speeds healing, and produces cleaner notch edges that remain readable for the animal’s lifetime. Waiting until pigs are larger makes the process significantly harder — if you allow pigs to become large (100 lb), the task is considerably more demanding mentally and physically.

In North Carolina, ear notching is recognized as a valid form of individual identification for swine under state law and NCDA&CS guidelines, but its legal weight depends on context. Not every notched pig automatically satisfies official ID requirements — the rules vary based on whether the animal is moving interstate, being exhibited, or staying on the farm of origin.

Pro Tip: Perform ear notching last when processing a new litter. Because notching causes more bleeding than teeth clipping, navel care, or injections, doing it last prevents pen mates from being attracted to fresh wounds on already-processed piglets.

When Ear Notching Qualifies as Official Identification in North Carolina

North Carolina law draws a clear line between pigs that stay on your property and pigs that move off it. Swine that do not leave the premises of the swine owner are not subject to the identification requirement under this section. Once an animal leaves your property, however, identification becomes legally mandatory.

Any live swine that is transported on a public road within this state without identification as required by this section is presumed to be a feral swine and is also subject to regulation by the Wildlife Resources Commission under Chapter 113 of the General Statutes. Any person transporting a swine without identification is subject to a civil penalty under this Article. That presumption of feral status is a serious consequence — it can expose your animals to Wildlife Resources Commission jurisdiction and complicate any effort to recover them.

Individual identification — for example, official ear tag, ear notching, 840 tags, tattoo, or microchip (bring reader) — is required for swine moving into North Carolina from other states. The NCDA&CS Veterinary Division lists ear notching alongside these other methods as an accepted form of individual ID for interstate movement of breeding swine, provided other health documentation requirements are also met.

Ear notching qualifies as official identification if the ear notching has been recorded in the book of record of a purebred registry association. This federal standard, established by USDA APHIS, means that a notch pattern alone — without registry documentation — does not automatically constitute official ID for interstate movement of breeding animals. The registry record is what gives the notch its legal standing.

For exhibition purposes in North Carolina, all livestock must have a form of identification (ear tag, tattoo, ear notch, or microchip — readers must be supplied) and health certificates for out-of-state swine should contain a description of each animal including age, sex, breed, and any registrations, ear tag, or ear notch numbers.

How the 1-3-9 Ear Notching System Works

The universal ear notching system separates identification into two parts — one ear represents the litter, and the other identifies the individual pig within that litter. Once you understand the value assigned to each position on each ear, reading a pig’s identity becomes a straightforward addition problem.

The Right Ear — Litter Number

The right ear is used for the litter mark, and all pigs in the same litter must have the same notches in the right ear. There are five designated zones (1, 3, 9, 27, and 81) in the litter ear. In zones 1, 3, 9, and 27, there can only be two notches, so if there are two notches in all four zones, that would represent Litter 80. A notch in zone 81 basically doubles the system, allowing producers to identify litters well beyond 80.

The Left Ear — Individual Pig Number

The left ear is used for notches to show an individual pig’s number in the litter, and each pig will have different notches in the left ear. The left ear is divided into three sections, with values of 1, 3, and 9. The maximum individual number is 26, allowing for easy identification of piglets within the same litter.

Reading the Notches

To develop a number, make notches in different parts of the ear in such a way that their numerical values will add up to the desired number. For proper identification to be made, it is essential that the notches be placed in the appropriate area of the ear so that the mark is clearly a 1 versus a 3, or a 9 versus a 27.

For example, a pig with a single notch in the 9-position and a single notch in the 3-position of the right ear belongs to Litter 12. If the left ear has a single notch in the bottom inside (3) location, that pig is individual number 3 from litter 12. You would record this animal as pig 12-3.

Since confusion over which ear is the “left ear” can easily occur depending on viewing the pig from the front or the rear, a good way to remember which is the left ear is to always look the pig in the face — then, if read left to right, it would always be litter number then pig number.

Equipment and Technique

Use a V-ear notcher to notch piglets weighing less than about 25 pounds. These notchers typically make a notch that is 3/16 to 1/4 inch deep. For larger pigs, a notcher that makes notches 1/2 inch deep is recommended. Avoid making notches too shallow, as they may become hard to read or possibly heal shut.

Avoid placing a notch midway in the outside edge of either ear. Such marks can easily be mistaken for either a 1 or a 3, or a 9 or a 27. Leave at least 1/4 inch between notches, and avoid making notches too close to the head.

Pro Tip: If you are new to ear notching, contact your local North Carolina Cooperative Extension office before your first litter arrives. Working alongside an experienced producer or extension agent on your first few litters builds the muscle memory needed to place clean, accurate notches consistently.

Ear Notching for Purebred Registry Compliance in North Carolina

If you raise registered purebred swine in North Carolina — Berkshire, Duroc, Hampshire, Yorkshire, or any other recognized breed — ear notching is not just a management tool. It is the foundation of your registry paperwork and the key to maintaining the integrity of your breeding records.

The Certified Pedigreed Swine registry uses a structured notching calendar tied to farrowing seasons. January 1 and July 1 of each year are the starts of each farrowing season. Litter numbers reset or advance according to this schedule, so accurate notching tied to the correct season is required for registry submissions to be accepted.

No more than two notches may be made at any position. Exceeding this limit creates an unreadable or invalid mark that a registry will reject. Consistency within a litter is equally important — the right ear is used for the litter mark, and all pigs in the same litter must have the same notches in the right ear.

At the federal level, ear notching qualifies as official identification if the ear notching has been recorded in the book of record of a purebred registry association, and tattoos on the ear or inner flank of any swine also qualify if the tattoos have been recorded in the book of record of a swine registry association. This means your registry documentation must accompany the animal whenever it moves interstate or is exhibited — the physical notch alone is not sufficient without the paperwork.

The National Swine Registry (NSR) also requires that all animals exhibited at NSR or National Junior Swine Association events be identified with an official, permanently-numbered ear tag in addition to any breed registry documentation. The NSR and NJSA work diligently to comply with swine health regulations for shows and sales hosted across the United States. Each state in which the NSR or NJSA hosts events has regulations for animal health and the identification of swine that move across state lines. These regulations vary from state to state.

For North Carolina producers showing purebred animals at state fairs or breed shows, you should plan to have both your registry papers (which document your notch pattern) and a compliant ear tag in place before the animal leaves your farm. Check with the NCDA&CS Veterinary Division for the most current exhibition health certificate requirements.

Ear Notching vs. Ear Tags, Tattoos, and RFID in North Carolina

North Carolina and federal rules recognize multiple forms of swine identification, and each method has specific strengths, limitations, and appropriate use cases. Understanding the differences helps you choose the right method — or combination of methods — for your operation.

ID Method	Permanent	Official for Interstate Movement	Best Use Case	Key Limitation
Ear Notching	Yes	Yes (with registry record)	Purebred/registered swine, 4-H projects, farm records	Requires registry documentation for official status
Official Ear Tag (840 Tag)	Yes	Yes	Interstate movement, shows, auctions	Can be lost or removed; requires Premises ID
Tattoo	Yes	Yes (with registry record or PIN)	Slaughter channels, breeding swine	Must be legible; slap tattoos limited to slaughter only
RFID / Microchip (840)	Yes	Yes	High-value animals, traceability programs	Requires reader on-site at all times
Premises ID (PIN) Tag	Yes	Yes (cull breeding stock)	Cull sows/boars entering slaughter channels	Not valid for feeder pigs or show pigs

Ear Tags (840 Tags)

There are two main categories when it comes to official ID for swine — 840 tags and Swine Premises tags. 840 tags are USDA-approved tags for official individual animal identification. They will have a unique 15-digit number that always starts with “840,” which is the country code for the US. Increasingly, 840 tags are being required for swine shows, state and county fairs, and auctions.

An official ear tag is a source of animal identification that, with accurate movement records, provides the ability to trace animals to their origin. This capability is critical in the event of an animal disease emergency to help locate what points the animal has been in contact with.

Tattoos

Slaughter and feeder swine may use tattoos bearing the 7-character federal identification number (PIN) or 6-to-8-character state location identification number (LIN) of the premises where the swine originated. Official swine (slap) tattoos can be used for swine moving directly to slaughter only. Ear notches can be used for breeding, feeding, and exhibition swine, giving notching broader applicability than slap tattoos across different production contexts.

RFID and Microchips

Animals at exhibition, transported, or sold must be accompanied by a microchip reader and the registration certificate. Animals sold without transfer of registration papers — such as to slaughter or through livestock markets — must be identified with visible official ID such as ear tags or tattoos. This is a practical limitation of microchips: they require electronic readers, and visible ID remains mandatory when registration papers do not transfer with the animal.

The takeaway for North Carolina producers is that ear notching remains the most cost-effective permanent ID method for purebred and registered swine, but it works best when paired with proper registry documentation. For commercial operations moving pigs through markets or across state lines, an official 840 ear tag or PIN tag is often the cleaner compliance path. Many producers use both — notching for internal records and registry compliance, tagging for regulatory movement requirements.

Important Note: If you transport swine without any form of identification on a public road in North Carolina, the animal is legally presumed to be feral. Always confirm which identification method satisfies the specific requirement — on-farm, interstate, exhibition, or slaughter — before your pigs leave the property.

State-Specific Swine Identification Rules That Affect Ear Notching in North Carolina

North Carolina’s swine ID framework is built on a combination of state statute, NCDA&CS administrative rules, and federal Animal Disease Traceability (ADT) requirements. Understanding how these layers interact helps you stay compliant whether you’re moving pigs down the road or across state lines.

On-Farm Exemption

The clearest rule in North Carolina is the on-farm exemption: swine that do not leave the premises of the swine owner are not subject to the identification requirement. This means a small-scale producer who farrows, raises, and processes pigs entirely on one property has no state-mandated ID obligation. The moment an animal moves off that property onto a public road, however, all ID requirements apply.

Feral Swine Distinction

North Carolina has a significant feral swine problem. Feral swine damage to property, agriculture, and other assets costs the United States an estimated $1.5 billion each year in damages and control costs. There is no closed season for trapping feral swine; however, in addition to a hunting or trapping license, a feral swine trapping permit issued by NCWRC is required. The legal presumption that unidentified swine on public roads are feral is not just a technicality — it reflects an active regulatory effort to control the state’s feral hog population.

Proper ear notching or other official ID is your clearest defense against having your domestic pigs treated as feral animals. This is especially important for producers in rural counties where domestic and feral hogs may share habitat near property boundaries.

Interstate Import Requirements

If you are bringing swine into North Carolina from another state, the NCDA&CS requires a comprehensive package of documentation. An Interstate Certificate of Veterinary Inspection must be completed by a licensed and accredited veterinarian within 30 days. Swine must originate from a Validated Brucellosis-Free herd or Free State, and must originate from Qualified Pseudorabies-Negative herds or Pseudorabies Stage IV or Stage V Free State.

Individual identification — including ear notching — must accompany the health certificate. For breeding swine originating from states with active Pseudorabies concerns, breeding swine and all other swine being shipped to a breeding swine premise originating from Stage II, II/III, or III areas or states must also be isolated and test negative to a statistical 95/5 sample test using a Pseudorabies serological approved between 30 and 60 days after arrival and before being added to the herd.

Exhibition Requirements

For North Carolina State Fair and other NCDA&CS-regulated exhibitions, swine from out-of-state exhibitors (including market hogs) must be accompanied by an official health certificate issued within 30 days of entry signed by an accredited veterinarian, or an approved state or federally employed veterinarian. The health certificate must include a description of each animal, including any ear notch numbers, making accurate notching essential for show compliance.

Fee Authority

The Board of Agriculture may adopt rules to charge any swine owner a fee for the identification required under this section. The fee may not exceed the actual cost to the Department of Agriculture and Consumer Services for the identification approved by the State Veterinarian and any direct administrative costs associated with providing the identification to swine owners.

For questions specific to your operation, contact the NCDA&CS Veterinary Division directly or work with an accredited veterinarian familiar with North Carolina’s swine ID rules. Producers raising other regulated animals alongside swine may also want to review backyard chicken laws in North Carolina and beekeeping laws in North Carolina, as multi-species operations often face overlapping regulatory requirements from NCDA&CS.

Ear notching has remained a cornerstone of swine identification for decades because it is permanent, low-cost, and readable without any equipment. In North Carolina, it satisfies official ID requirements when properly documented through a purebred registry, and it serves as one of several accepted methods for interstate movement and exhibition compliance. Pair your notching program with current registry records, and ensure you understand when an official ear tag or tattoo is additionally required — that combination keeps your operation compliant from the farrowing barn to the show ring.

For a broader look at how North Carolina regulates animals on your property, explore the state’s general pet laws, animal cruelty statutes, and leash laws — all of which can intersect with livestock management on mixed-use rural properties.