Twilight’s Story
Photo courtesy of Cornell Baker Institute
Twilight was a Thoroughbred mare bred and raised at Cornell University’s McConville Barn who made history as the first horse selected to have her genome fully sequenced. Chosen by the National Institutes of Health as the reference animal for the international Horse Genome Project, Twilight played a central role in a groundbreaking effort that began in 1995 and concluded in 2006. Her genetic blueprint became the foundation for understanding the equine genome, marking a major milestone not only in horse science but in veterinary medicine as a whole.
The impact of Twilight’s contribution continues to be felt today. Her genome has helped researchers identify genes linked to inherited conditions such as Lavender Foal Syndrome and has advanced studies into diseases like sarcoid tumors. This work, led in part by scientists at Cornell’s Baker Institute for Animal Health, has improved the diagnosis, treatment, and prevention of equine illnesses worldwide. Twilight’s legacy lives on through ongoing research, educational programs, and the many scientific breakthroughs made possible by her remarkable contribution to equine health.