Brucellosis Laws in Kentucky: What Livestock Owners Need to Know

Brucellosis is one of the most closely watched livestock diseases in the United States, and Kentucky has built a regulatory framework designed to keep it that way. Whether you raise cattle, bison, or other susceptible animals, understanding the state’s brucellosis rules is not optional — it is a legal requirement tied to testing, vaccination, movement permits, and quarantine authority.

This guide walks you through every layer of Kentucky’s brucellosis regulations, from the state’s current disease-free classification to the penalties you face for non-compliance. You will find plain-language explanations of the administrative regulations that govern your herd, along with practical guidance on what each rule means for your day-to-day operations.

What Is Brucellosis and Why It Is Regulated in Kentucky

Brucellosis is a bacterial infection caused by organisms in the genus Brucella. It is a contagious, infectious, and communicable disease also known as Bang’s disease, undulant fever, and contagious abortion. The disease primarily targets livestock but carries serious public health implications because it can cross the species barrier to humans.

Brucellosis is a contagious and costly disease typically affecting cattle, bison, cervids such as elk and deer, and swine. It is a bacterial infection that spreads from animals to people most often through ingestion of unpasteurized milk, cheese, and other dairy products. In livestock, the disease causes reproductive losses including spontaneous abortions, stillbirths, and reduced milk production — making it economically devastating for producers.

Kentucky regulates brucellosis under Kentucky Revised Statutes Chapter 257 and the Kentucky Administrative Regulations found in 302 KAR Chapter 20. These rules give the Kentucky Department of Agriculture (KDA) and the State Veterinarian broad authority over testing, vaccination, movement, and quarantine of animals. KRS 257.030 authorizes the board to establish necessary quarantines and other measures to control the movement of animals into, through, or within Kentucky, and the administrative regulations establish health requirements for entry, including entry for sales or exhibition, for livestock and animals into Kentucky.

The cooperative State-Federal eradication program has been running for decades. Current APHIS Veterinary Services disease eradication programs include cooperative State-Federal efforts directed at cattle and swine brucellosis, bovine and cervid tuberculosis, and pseudorabies in swine. Kentucky participates fully in this program, and its current disease status reflects the success of that effort. You can read how brucellosis laws in Missouri compare if you move animals across that border regularly.

Kentucky’s Brucellosis Classification Status

Kentucky holds the highest possible disease classification under the federal brucellosis framework. Under 9 CFR § 78.43, Kentucky is listed as a validated brucellosis-free state — meaning the federal government formally recognizes the state as free from Brucella abortus infection in its cattle herds.

This status was not always the case. In 1997, the USDA APHIS amended the brucellosis regulations concerning the interstate movement of cattle by changing the classification of Kentucky from Class A to Class Free, having determined that Kentucky meets the standards for Class Free status. Kentucky has maintained that standing ever since.

The brucellosis regulations contained in 9 CFR Part 78 provide a system for classifying states or portions of states according to the rate of Brucella abortus infection present and the general effectiveness of a brucellosis control and eradication program. The classifications are Class Free, Class A, Class B, and Class C, and states or areas that do not meet the minimum standards for Class C status are required to be placed under Federal quarantine. Restrictions on moving cattle and bison interstate become less stringent as a state or area approaches or achieves Class Free status.

To qualify for and maintain Class Free status, a state must meet strict surveillance thresholds. For initial classification or reclassification, all cattle herds in the state or area must have remained free of Brucella abortus for 12 consecutive months, based on surveillance and epidemiologic investigations, and the state or area must have a cattle herd infection rate of 0.0 percent or 0 herds per 1,000.

Because Kentucky is Class Free, many routine brucellosis testing requirements are relaxed for intrastate sales and exhibitions. Testing shall not be required for sale and exhibition if Kentucky has Class Free status — a direct benefit that producers enjoy as a result of the state’s long-standing disease-free record. You can compare this framework with how neighboring states handle the issue by reviewing brucellosis laws in Michigan or brucellosis laws in Minnesota.

Vaccination Requirements in Kentucky

Even though Kentucky holds Class Free status, official calfhood vaccination remains an important tool for herd management and interstate movement eligibility. The state’s vaccination requirements are detailed in 302 KAR 20:055 and set out precise standards for who can vaccinate animals, how they must be identified, and what records must be kept.

Female animals that are vaccinated shall be officially vaccinated between four and ten months of age with an approved reduced dosage Brucella vaccine and identified by a vaccination tattoo in the ear and an official vaccination ear tag, or, in the case of registered cattle, by an identification tattoo.

The placement and content of the tattoo and ear tag are both regulated. The vaccination tattoo shall be placed in the right ear and shall legibly identify the quarter of the year, shield, and the calendar year of vaccination. The official vaccination ear tag shall be placed in the right ear and shall identify the animal according to the state of origin, official vaccinate status, and individual identification number.

Animals shall be vaccinated, branded, or tested by, or under the supervision of, a licensed, accredited veterinarian or by an authorized agent of the board or by authorized federal personnel. This means you cannot self-administer official brucellosis vaccinations — the process requires a credentialed professional.

The regulations also protect the integrity of vaccination records. No person shall tamper with the vaccination tattoo or official vaccination ear tag, and no person shall re-tattoo any animal unless approval is first obtained from the Kentucky State Veterinarian or from Kentucky’s area veterinarian in charge (AVIC). Tampering with these identifiers is a regulatory violation that can trigger serious consequences.

Approved livestock assembly facilities add another layer of accountability. These facilities shall be approved by the Department of Agriculture and be designated only for cattle assemblage. Vaccination, testing, or branding requirements shall be met prior to release of animals from these facilities, and records of state and farm of origins shall be kept by the operators.

Testing Requirements for Cattle and Bison in Kentucky

Testing requirements in Kentucky depend heavily on the purpose of the movement, the animal’s age and sex, its vaccination status, and whether the herd of origin holds certified brucellosis-free herd status. Understanding which exemptions apply to your animals can save you significant time and cost.

For change-of-ownership transactions involving sexually intact females, the baseline rule is clear. Sexually intact females twelve months of age or older shall be negative to an official brucellosis test within thirty days prior to change of ownership, unless the cattle originate directly from a brucellosis certified free herd; are official calfhood vaccinates of the dairy breed less than twenty months of age; are official calfhood vaccinates of the beef breeds less than twenty-four months of age; or are open heifers less than eighteen months of age designated for feeding purposes.

Certified free herd status is a key exemption trigger. Animals originating from a brucellosis certified herd shall be exempt from testing, and the herd certification number and date of last herd test shall be indicated on the Certificate of Veterinary Inspection (CVI).

For animals headed directly to slaughter, a specific exemption applies. Cattle or other bovine species consigned for immediate slaughter may enter Kentucky without an official test for brucellosis or tuberculosis if they are consigned for immediate slaughter to a recognized slaughtering center or to an approved state-federal stockyard for reconsignment to a recognized slaughtering center. However, animals diverted en route shall be in violation of this administrative regulation.

Stockyards carry their own testing-related responsibilities. Animals tested for brucellosis by the designated veterinarian shall remain at the facility until the results are known negative. This hold requirement ensures that reactive animals do not re-enter commerce before their status is confirmed.

For private treaty farm-to-farm sales within Kentucky, a CVI exemption exists. Cattle or other bovine species sold or bartered by private treaty and moving directly from farm to farm shall be exempt from the CVI requirement if the seller or barterer’s name and premises of origin information are recorded and maintained for two years by the recipient of the animal.

If you also manage goats, note that the testing standard differs. Any goat that originates from a premises that has been infected with or exposed to B. melitensis or other Brucella species within the previous twelve months shall be negative to a Brucella test within thirty days for sale or exhibition. For more on goat-related regulations in the state, see goat ownership laws in Kentucky.

Interstate and Intrastate Movement Rules in Kentucky

Movement rules are where brucellosis compliance becomes most operationally complex. Kentucky regulates both the entry of animals from other states (interstate movement) and the sale and exhibition of Kentucky-origin animals within the state (intrastate movement) under separate administrative regulations.

Interstate Entry Requirements

All animals entering Kentucky must carry proper documentation. All animals entering Kentucky shall be subject to the requirements established in 302 KAR 20:020. All animals shall be accompanied by a Certificate of Veterinary Inspection (CVI) or other official movement document except for exemptions listed under each species section.

For cattle and bison entering from other states, brucellosis testing requirements depend on the origin state’s classification. Animals from Class Free states shall be exempt from testing. Since all U.S. states currently hold Class Free status, cattle moving from any other state to Kentucky are generally exempt from brucellosis testing at entry — provided they originate from a Class Free state and carry the required CVI documentation.

For exotic ruminants entering Kentucky, the rules are more stringent. A person shall not import an exotic ruminant or bovine unless the animal tests negative on an official test as provided in 9 C.F.R. 78.1 and conducted not more than thirty days prior to entry date.

Intrastate Movement and Sales

For Kentucky-origin animals sold or exhibited within the state, the rules under 302 KAR 20:065 govern. Because Kentucky holds Class Free status, many routine testing requirements are suspended for intrastate purposes. Testing shall not be required for sale or exhibition if the animals are moving from a brucellosis certified herd, and the herd number and last test date shall be recorded on the CVI.

Stockyards must maintain physical infrastructure to support brucellosis compliance. The person operating a stockyard shall provide separate pens for isolating animals classed as reactors to brucellosis or any contagious, infectious, or communicable disease, and these pens shall be permanently identified as isolation or quarantine pens, with the words legibly and prominently posted on the pen gates.

If you regularly transport livestock across state lines, review transporting livestock laws in Kentucky for the broader set of rules that apply beyond brucellosis specifically. You may also find it helpful to compare how brucellosis laws in Nebraska and brucellosis laws in Nevada handle interstate movement for context.

Reporting and Quarantine Requirements in Kentucky

Kentucky’s brucellosis framework includes mandatory reporting obligations and broad quarantine powers that activate the moment a suspected case is identified. These provisions exist at both the state and federal level and apply to livestock owners, veterinarians, and facility operators alike.

Animal Disease Reporting

When brucellosis is suspected or confirmed in a livestock herd, the Kentucky Department of Agriculture’s Office of the State Veterinarian (OSV) must be notified. The State Veterinarian holds authority under KRS Chapter 257 to investigate suspected cases, collect samples, and direct the response. Accredited veterinarians who identify suspect animals are required to report findings to the OSV promptly.

Disease control and eradication measures include quarantines to stop the movement of possibly infected or exposed animals, testing and examination to detect infection, destruction of infected or sometimes exposed animals to prevent further disease spread, treatment to eliminate parasites, vaccination in some cases, and cleaning and disinfection of contaminated premises.

Human Case Reporting

On the public health side, brucellosis is a reportable disease in Kentucky. Brucellosis is listed among the conditions that must be electronically reported to the Kentucky Department for Public Health through the Kentucky Health Information Exchange within five business days. This reporting obligation applies to healthcare providers and laboratories that confirm human brucellosis cases.

Quarantine Authority and Procedures

Once a herd is identified as affected, quarantine authority kicks in immediately. Federal regulations describe the conditions that define an exposed animal and the obligations that follow. A brucellosis-exposed animal includes, except for brucellosis reactors, animals that are part of a herd known to be affected, or are in a quarantined feedlot or quarantined pasture, or are brucellosis suspects, or that have been in contact with a brucellosis reactor for a period of 24 hours or more, or for a period of less than 24 hours if the brucellosis reactor has aborted, calved, or farrowed within the past 30 days or has a vaginal or uterine discharge.

Maintaining Class Free status requires ongoing surveillance infrastructure. To maintain Class Free classification, regulations have required Class Free states to conduct surveillance by carrying out brucellosis ring tests to ensure that all cattle herds producing milk for sale are tested at least twice per year at approximately six-month intervals, and to collect blood samples from at least 95 percent of all cows and bulls two years of age or over at each recognized slaughtering establishment.

Stockyards also play a surveillance role. Stockyards shall submit to the OSV a Stockyards Multipurpose Form within seven calendar days of a sale, and beginning January 1, 2021, that form or its contents shall be submitted to the OSV electronically as an Excel or other importable format. This reporting chain helps the state track animal movements and identify potential exposure events quickly.

Penalties for Brucellosis Violations in Kentucky

Non-compliance with Kentucky’s brucellosis regulations carries real legal consequences. The penalty structure operates across multiple layers — state administrative regulations, Kentucky Revised Statutes, and federal law — and violations can result in civil fines, criminal charges, loss of livestock market access, and forced depopulation of infected herds.

Regulatory Violations Under 302 KAR Chapter 20

Administrative violations of the Kentucky brucellosis regulations — such as failing to test animals before a change of ownership, moving animals without a required CVI, or diverting slaughter-consigned animals en route — expose you to enforcement action by the KDA. The State Veterinarian has authority to issue stop-movement orders, require corrective testing, and refer cases to the Kentucky Attorney General’s office for prosecution.

Tampering and Falsification

Some brucellosis violations carry specific prohibitions with heightened enforcement attention. No person shall tamper with the vaccination tattoo or official vaccination ear tag, and no person shall tamper with an official brand, ear tag, or other individual animal identification device. Tampering with official identification is treated as a serious offense because it undermines the traceability system that supports disease control across state lines.

Interstate Movement Violations

Moving animals across state lines in violation of federal brucellosis regulations triggers USDA APHIS enforcement authority in addition to state penalties. Federal violations under 9 CFR Part 78 can result in civil penalties, seizure of animals, and injunctive relief. The Administrator may amend the state classification to reclassify states or remove validated brucellosis-free status when the Administrator determines that such states meet or do not meet the applicable standards. In the case of any reclassification to a lower class or removal of validated brucellosis-free status, the State animal health official will be notified and given an opportunity to present objections and arguments prior to reclassification. A reclassification triggered by a compliance failure in your herd could affect the entire state’s movement privileges.

Slaughter and Depopulation

For confirmed brucellosis-positive herds, depopulation may be mandatory. A Class Free state or area may have no more than one herd determined to be affected with brucellosis within a two-year period, and if a herd is found to be affected with brucellosis, the herd must be depopulated within 60 days of an infected animal being detected. Failure to comply with a depopulation order is itself a separate violation subject to additional enforcement action.

Kentucky’s brucellosis laws are part of a broader animal health regulatory environment. If you manage livestock or other animals in the state, you may also want to review beekeeping laws in Kentucky, backyard chicken laws in Kentucky, or the rules around rooster laws in Kentucky depending on the scope of your operation. For general animal control matters, dog leash laws in Kentucky and leash laws in Kentucky offer relevant context as well.

Staying compliant with Kentucky’s brucellosis regulations ultimately protects more than your herd — it protects the Class Free status that benefits every livestock producer in the state. When you follow the testing, vaccination, movement, and reporting rules, you contribute to the cooperative disease-free environment that keeps Kentucky’s cattle markets open and competitive. If you have questions about your specific situation, contact the Kentucky Department of Agriculture’s Office of the State Veterinarian directly or consult with a USDA-accredited veterinarian licensed in Kentucky.