The Marksman V, winner of the $832,707 Ruidoso Derby in New Mexico in June, and 12 other Quarter Horses, all trained by Heath Taylor, have been euthanized in the last 10 days in California and Texas after being diagnosed with equine infectious anemia, Taylor and the California Horse Racing Board said on Thursday and Friday.
Taylor said on Friday that six of his horses at Lone Star Park have been euthanized after being diagnosed with equine infectious anemia. He did not name the individual runners, citing advice from Texas officials.