Curlin, at 22 one of the most influential stallions in modern history, will not cover any more mares during the 2026 breeding season after a brief illness, said Hill 'n' Dale at Xalapa owner John Sikura Wednesday afternoon. "Curlin, about 10 days ago, exhibited some discomfort," said Sikura. "Dr. (Nathan) Slovis from Hagyard examined him and found an ulcer which was outside of his stomach," said Sikura. "This is highly unusual. He exhibited symptoms of pain, we treated him, and he had three days off breeding mares. He had a...