A young stallion with a modest $7,500 fee stands tall as the most prolific North American-based sire of 2012 juvenile stakes winners. In heading that statistical category, Henny Hughes, who stands at Walmac Farm in Lexington, Ky., finished the year ahead of sires commanding $60,000, $70,000, even $100,000 fees, and his six stakes-winning 2-year-olds represent the most in a single season since Posse sired seven in 2007.