These are from Mr. Hirsch's popular column ""Questions and Answers"" and he is aided, in his answers, by the experts--Bill Shoemaker on riding, Eddie Nelvoy on training, Dr. Charles Hagyard on fertility, etc. And this will satisfy everyone from the prospective owner to the hopeful handicapper with information on everything from blood transfusions, ""curbed hocks,"" training costs, tax depreciation, common injuries, to how the quinella differs from the twin double and Man O'War's stud fee. Did you know that jockey's ""silks"" are really nylon? A brisk, lively track-down.