UC Davis Solves Two-Decade Cloning Problem for Quarter Horses

Researchers validate method to distinguish cloned horses from originals, preserving breed registry integrity.

Mar. 17, 2026 at 12:23am

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Researchers at the University of California-Davis Veterinary Genetics Laboratory have successfully validated a scientific approach to qualify or exclude parentage in cases where one of the reported parents may be a clone. This solves a long-standing problem for the American Quarter Horse Association, which has struggled to verify the pedigree of horses that may have been produced from clones.

Why it matters

Cloning has become more common in horse breeding, raising concerns about the integrity of breed registries and pedigrees. This breakthrough from UC Davis allows the American Quarter Horse Association to definitively distinguish cloned horses from the original animals, preserving the authenticity of the breed's records.

The details

The key challenge was that clones are genetically identical to the original animal, making standard DNA parentage tests ineffective at distinguishing them. The UC Davis team developed an approach that goes beyond just tracing the maternal line through mitochondrial DNA, providing the comprehensive validation needed to definitively identify clones. This solution will now be implemented by the American Quarter Horse Association to ensure the integrity of the breed's pedigree.

  • The issue of cloned horses has been a concern for the American Quarter Horse Association since the first cloned American Quarter Horse was produced.
  • Researchers at UC Davis presented their findings to the AQHA Stud Book and Registration Committee during the 2026 AQHA Convention in Las Vegas.
  • The American Quarter Horse Association will fund additional research and development to bring this new testing capability into practical application.

The players

UC Davis Veterinary Genetics Laboratory

A leading research institution in equine DNA testing and genetics, located at the University of California-Davis.

Dr. Rebecca Bellone

Director of the UC Davis Veterinary Genetics Laboratory, who presented the research findings to the AQHA.

American Quarter Horse Association (AQHA)

The breed registry for American Quarter Horses, which has been grappling with the challenge of verifying pedigrees in the face of cloning technology.

Tammy Canida

The AQHA Registrar, who noted that the cloning issue has been an ongoing concern for the breed registry.

Jim Brinkman

The 2026 incoming AQHA president, who collaborated with Dr. Bellone to initiate the research project.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident (San Francisco Chronicle)

“Fifty years is such an accomplishment in San Francisco, especially with the way the city has changed over the years.”

— Gordon Edgar, grocery employee (Instagram)

What’s next

The American Quarter Horse Association will fund additional research and development to bring this new testing capability into practical application.

The takeaway

This breakthrough from UC Davis allows the American Quarter Horse Association to definitively distinguish cloned horses from the original animals, preserving the authenticity of the breed's pedigree records and ensuring the integrity of the registry in the face of growing cloning practices in the equine industry.