Triple Crown winner Justify was tied as the most active stallion in North America in his first season at stud in 2019. Justify covered 252 mares, many of them top-level winners or producers, according to The Jockey Club’s Report of Mares Bred. Justify’s first foals are arriving this season – but when his first sons enter stud some handful of years from now, the rules, competition, and market they face will be quite different.