Prominent Central Kentucky stallion Summer Squall, who has always experienced some fertility problems, has gotten a very low percentage of mares in foal this season; however there are no plans to remove him from stallion service.Bill Farish of Lane's End Farm, where the 15-year-old son of Storm Bird stands, said Summer Squall has impregnated only three of the 29 mares bred to him this year at the Versailles, Ky., nursery."He's syndicated so there is no sense taking him out of service," Farish said. "He's set to cover some of the late mares."Summer Squall started off the season by getting one of his first mares in foal, then experienced a slow down. The other two pregnancies have come recently, giving Farish renewed hope."In the past, he went through stages of increased fertility," he said. "We've examined his semen, and it looks as good as ever."According to The Jockey Club Report of Mares Bred, Summer Squall was bred to 51 mares in 2001. In 2000, he covered 72 mares and 31 produced live foals; in 1999, he covered 55 mares and 23 produced live foals.Summer Squall, who was produced from the Secretariat mare Weekend Surprise, has sired 26 stakes winners, including 1999 Horse of the Year Charismatic. The last horse before War Emblem to win both the Kentucky Derby (gr. I) and Preakness Stakes (gr. I), Charismatic stands at Lane's End.Summer Squall's stud fee this year is $50,000.