They look like ordinary foals, docile with honey brown coats and white facial patches, content to spend their days munching alfalfa in a cordoned-off pasture in rural Buenos Aires province.
But these five 10-month-olds are the world’s first genetically edited horses: cloned copies of a prize-winning horse named Polo Pureza, or Polo Purity, with a single DNA sequence inserted using CRISPR technology with the aim of producing explosive speed.
Kheiron Biotech, the Argentine company that created the horses, says gene-editing has the potential to revolutionize horse breeding.
A cloned newborn horse stands next to its surrogate mother in a pen at a horse birthing hospital, in San Antonio de Areco, near Buenos Aires, Argentina July 29, 2025. REUTERS
While cloning creates a genetically identical copy, CRISPR
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