Lexington native Frank Penn raised both Thoroughbreds and tobacco for the better part of 50 years at Pennbrook Farm, his 300-acre spread out on Mt. Horeb Pike. Based on that experience, he has some words of caution for the bloodstock industry as it enters a new era of protectionism with The Jockey Club's recent rule change limiting to 140 the number of mares a stallion can cover, starting with foals of 2020. In short, Penn said, the Thoroughbred industry should read Kentucky's now-withered tobacco leaves to glean a lesson in...