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The '''Dosage Index''' is a mathematical figure used by breeders of [[thoroughbred]] race horses, and sometimes by bettors handicapping horse races, to quantify a horse's ability, or inability, to negotiate the various distances at which horse races are run.
Interest in determining which sires of race horses transmit raw speed, and which sires transmit stamina (defined as the ability to successfully compete at longer distances) to their progeny dates back to the early 20th Century, when a [[France|French]] researcher, Lt. Col. J. J. Vullier, published a study on the subject, which was covered in greater detail by an [[Italy|Italian]] breeding expert, Dr. Franco Varola, in two books he authored, entitled ''Typology Of The Race Horse'' and ''The Functional Development Of The Thoroughbred''.
However, these observations attracted little interest from the general public until [[1981]], when ''Daily Racing Form'' columnist Leo Rasmussen included the concept in his analysis of the upcoming [[Kentucky Derby]] for that year. The idea rapidly caught on, and the term "Dosage Index" has been a fixture in the lexicon of [[horse racing]] ever since.
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