Swine Ear Notching Laws in Mississippi: What Pig Producers Need to Know

Ear notching has been a cornerstone of swine identification for generations, and Mississippi pig producers still rely on it today — but its legal standing depends entirely on context. Whether you raise purebred show hogs, feeder pigs, or a small backyard herd, the rules governing when ear notching counts as official identification can affect your ability to move, sell, or register animals without running into compliance problems.

Mississippi’s swine identification requirements sit at the intersection of state Board of Animal Health regulations and federal USDA Animal Disease Traceability (ADT) standards. Getting the details right protects your animals, your records, and your operation’s reputation. This guide walks you through every layer of the law so you know exactly where ear notching fits — and where it falls short.

What Is Swine Ear Notching and When It Is Used in Mississippi

Ear notching is a permanent identification method that involves cutting small V-shaped notches into specific positions on a pig’s ears at or shortly after birth. The practice is widely used in the swine industry as a system of animal identification, with variations in systems, but all of them identify a pig by litter number and individual pig number. Unlike a tag that can fall out or a tattoo that requires restraint to read, a properly placed notch stays with the animal for life.

In Mississippi, ear notching shows up in three main situations: purebred breeding operations that register animals with national breed associations, 4-H and FFA youth show programs where pigs must be enrolled with documented identification, and small farm operations that want a low-cost, permanent way to track litters. Proper notching at 1–3 days old minimizes stress and ensures healthy healing. That timing matters — waiting until a pig weighs 100 pounds makes the process significantly harder on both the animal and the producer.

It is worth noting from the outset that ear notching does not automatically qualify as official identification under Mississippi or federal law. Its legal status depends on whether the notch has been recorded in a recognized registry and whether the movement context requires a higher standard of ID. If you are moving commercial feeder pigs into Mississippi, for example, ear tags are required — not notches.

Pro Tip: Notch piglets the same day you dock tails and clip needle teeth. Combining these tasks at 1–3 days of age keeps handling stress low and gives notches the best chance to heal cleanly before the pig grows.

When Ear Notching Qualifies as Official Identification in Mississippi

Under federal USDA guidelines that Mississippi enforces through the Mississippi Board of Animal Health (MBAH), ear notching qualifies as official swine identification only under a specific condition. Ear notching counts as official identification if the ear notching has been recorded in the book of record of a purebred registry association. Outside of that recorded-registry context, a notch alone does not meet the official ID standard required for interstate movement or disease traceability.

All swine must be accompanied by an official health certificate and a permit prior to movement, and all swine must be individually identified with official identification on the health certificate, with the exception of entry for exhibition only, in which case registration identification along with registration papers are allowed. That exhibition exception is the clearest scenario where a properly recorded ear notch — paired with breed registration papers — can serve as your official ID when bringing animals into the state.

Feeder pigs moving on shipment into Mississippi must be ear tagged and identified to the farm of origin, and be quarantined for 30 days to the farm of destination. This rule makes plain that ear notching is not a substitute for an ear tag when you are shipping commercial feeder pigs into the state. If you are receiving feeder pigs from out of state, each animal needs a tag — not just a notch.

Important Note: The MBAH’s regulations are updated periodically. Always confirm current entry requirements directly with the Mississippi State Veterinarian at 601-359-1170 before moving swine across state lines.

How the 1-3-9 Ear Notching System Works

The simplest method and the one recommended by most breed associations is ear notching. The most common notching system is the 1-3-9 system. Understanding this system is non-negotiable if you plan to register animals, enter them in shows, or maintain records that hold up to scrutiny.

The system divides each ear into zones, with each zone assigned a numeric value. The right ear is used for the litter mark, and all pigs in the same litter must have the same notches in this ear. The right ear is on the pig’s own right. The litter mark ear is divided into five sections, and each section has a numerical value, either 1, 3, 9, 27, or 81. Each section, except for 81, can have 1 or 2 notches only.

The left ear is used for notches to show an individual pig’s number in the litter. 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. You add up the values of all notches in each ear to get the litter number (right ear) and the individual pig number (left ear).

Here is a practical example of how to read the system:

• Right ear (litter number): A notch in the 9-position and a notch in the 3-position adds up to litter 12.
• Left ear (individual pig number): A single notch in the 3-position identifies that pig as individual number 3.
• Full identity: This pig is recorded as 12-3 (litter 12, pig 3).

There are five designated zones (1, 3, 9, 27, and 81) in the litter ear and three designated zones (1, 3, and 9) in the individual pig ear. In zones 1, 3, 9, and 27, there can only be two notches, thus 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 with large operations to identify well over 100 litters before running out of combinations.

One orientation mistake trips up beginners consistently. The reference to left and right ear refers to the pig’s left or right ear, as viewed from the rear of the pig — left and right does not refer to the viewer’s left or right in a situation where the pig is facing the viewer. A simple fix: always face the pig when reading notches and think of it as the pig’s own left and right.

Ear	Purpose	Zone Values Available	Max Notches Per Zone
Right (pig’s right)	Litter number	1, 3, 9, 27, 81	2 (except 81: 1 only)
Left (pig’s left)	Individual pig number	1, 3, 9	2 per zone

Small notchers typically make a notch that is 3/16 to 1/4 inch deep, which is the preferable size for pigs under 25 pounds. 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. Always disinfect your notching tool between litters to prevent disease transmission.

Ear Notching for Purebred Registry Compliance in Mississippi

If you raise purebred swine — Duroc, Hampshire, Yorkshire, Berkshire, or any other breed with a national registry — ear notching is not just a management tool; it is often a registration requirement. When using the system of ear notching required by the purebred swine associations of the United States, the litter number is notched in the pig’s right ear, and the individual pig number is notched in the pig’s left ear.

The critical compliance step for Mississippi producers is recording the notch. A notch that exists only on the pig’s ear but has not been submitted to a breed registry does not qualify as official identification for movement or exhibition purposes. You must file the litter registration with the appropriate breed association, get the pig’s identity confirmed in their book of record, and keep those registration papers with the animal whenever it travels.

Youth involved in showing pigs learn responsibility and animal husbandry through identification and recordkeeping, and Mississippi 4-H and FFA programs reflect this expectation. Show superintendents at Mississippi county fairs and the state fair routinely verify that ear notches match the registration papers presented at check-in. A mismatch — or an unrecorded notch — can result in disqualification.

For Mississippi producers who sell breeding stock, the recorded ear notch also functions as a marketing asset. Buyers across the South look for animals whose litter and individual identity can be traced back through the registry, and a clean, properly placed notch that matches registration papers signals a well-managed operation. If you also raise goats, the same principle of documented permanent identification applies — you can review goat ownership laws in Mississippi for a parallel look at how the state handles livestock ID requirements across species.

Ear Notching vs. Ear Tags, Tattoos, and RFID in Mississippi

Ear notching is one of several identification methods recognized under state and federal rules, but it is not interchangeable with the others in every situation. Knowing which method fits which context keeps you compliant and avoids costly delays at sale barns or state entry checkpoints.

Ear Tags (NUES and 840 Tags): USDA 840 tags are the most common form of official ID tag. They have a unique 15-digit number beginning with 840, which is the United States country code. These tags are tamper-resistant and bear the U.S. shield. For commercial feeder pigs and slaughter swine moving into Mississippi, an ear tag is the required form of identification — a notch alone will not satisfy the entry requirement.

RFID Tags: Electronic Identification tags, also known as Radio Frequency Identification ear tags (RFID ear tags), can be utilized to store and track information through a database using a readable scanner. Swine producers and state animal health officials can now order RFID ear tags at no cost through a USDA APHIS program. APHIS has awarded a contract to Merck Animal Health to supply up to $20 million in RFID tags over the next five years, with tags intended for use in the sow and exhibition swine sectors. Mississippi sow producers and exhibition swine owners should take advantage of this program to strengthen traceability at no expense.

Tattoos: Tattoos on the ear or inner flank of any swine qualify as official identification if the tattoos have been recorded in the book of record of a swine registry association. Like ear notching, a tattoo’s official status is conditional on registry recording. Ink placed inside the ear lasts the life of the animal and cannot be lost or altered easily, which is why breed registries often require them. The limitation is readability: you need to restrain the animal and flip the ear to read a tattoo, making it impractical for quick sorting at a distance.

Ear Notching: Ear notches can be used for breeding, feeding, and exhibition swine when recorded with a purebred registry. For commercial or slaughter channels without registry backing, notches do not satisfy official ID requirements on their own.

ID Method	Permanent	Qualifies as Official ID	Best Use in Mississippi
Ear Notch	Yes	Only if recorded with purebred registry	Purebred breeding & shows
840 Ear Tag	Tamper-resistant	Yes	Commercial, feeder, slaughter swine
RFID Tag (840)	Tamper-resistant	Yes	Sow farms, exhibitions, disease traceability
Tattoo	Yes	Only if recorded with registry	Purebred breeding & shows

Pro Tip: If you show pigs at Mississippi county fairs and the state fair, confirm with show management whether they require an 840 tag in addition to your ear notch and registration papers. Many Mississippi shows now require both to align with National Swine Registry (NSR) and NJSA traceability standards.

State-Specific Swine Identification Rules That Affect Ear Notching in Mississippi

Mississippi’s swine identification framework is administered by the Mississippi Board of Animal Health, which enforces entry and movement requirements under Miss. Code Ann. §69-15-3. Several state-specific rules directly affect how and when ear notching fits into your compliance picture.

Entry requirements for all swine: All swine must be accompanied by an official health certificate and a permit prior to movement, with the number of the permit shown on the certificate. The health certificate must list each animal’s official identification. If you are relying on an ear notch as that ID, your breed registration papers must accompany the animal and the notch must be recorded in the registry’s book of record.

Feeder pig quarantine: Feeder pigs moving on shipment into Mississippi must be ear tagged and identified to the farm of origin, and be quarantined for 30 days to the farm of destination. This 30-day quarantine rule applies regardless of how the pig is identified — but the mandatory ear tag requirement means ear notching alone will not satisfy the entry standard for incoming feeder pigs.

Wild and feral swine prohibition: It is illegal to import wild or feral swine into Mississippi. This rule has no bearing on ear notching directly, but it reinforces that Mississippi takes swine movement controls seriously. Producers who keep heritage or semi-feral breeds should confirm their animals’ domestic classification before attempting to move them.

Disease testing for exotic swine: Exotic swine must be tested negative to a brucellosis and a pseudorabies test within 30 days prior to entry. If you raise a breed that could be classified as exotic under Mississippi rules, testing is required regardless of your identification method.

Herd health certification for feeder pig sales: The entire herd of origin of pigs consigned to a feeder pig sale must be inspected for health by a veterinarian within ten days prior to the sale, and the veterinarian must issue a certificate stating the herd is in good health. This requirement applies on top of individual pig identification — a notch or tag alone does not substitute for the herd health certificate.

Premises Identification Numbers (PINs) are also increasingly relevant for Mississippi swine producers. Premise identification is part of the Animal Disease Traceability Framework (ADT) that is designed to help identify animals to the locations they have been raised on or passed through during their lives. Obtaining a Premises ID number is typically a very simple process that involves contacting your state animal health agency. In Mississippi, that means calling the MBAH at 601-359-1170. Having a PIN on file makes it far easier to obtain official ear tags and to document movement records that complement your ear notching system.

If you manage other livestock alongside your swine operation, Mississippi’s identification and movement rules extend across species. Review transporting livestock laws in Mississippi for a broader look at health certificate and permit requirements, and check pet import laws in Mississippi if you are moving animals that could fall under alternative classifications. Producers who also keep backyard poultry alongside their pigs may find the backyard chicken laws in Mississippi and rooster laws in Mississippi pages useful for understanding how the state regulates different livestock categories on the same property.

For questions specific to your operation, contact the Mississippi Board of Animal Health directly or work with an accredited veterinarian who can issue health certificates and advise on current disease testing requirements. Regulations are amended periodically — the MBAH’s Chapter 12 entry requirements were last amended in August 2022 — so verifying current rules before any interstate movement is always the right call.

Understanding where ear notching fits within Mississippi’s swine identification rules puts you in a stronger position whether you are registering a litter of purebred Durocs, selling feeder pigs at a local association sale, or preparing show hogs for the county fair circuit. The notch itself is just the start — what counts legally is the record behind it. Keep your registry paperwork current, pair notches with the appropriate official tags when the situation demands it, and contact the state veterinarian whenever you are unsure about a movement. That combination of good recordkeeping and proactive compliance is what separates operations that move animals smoothly from those that get stopped at the state line.