High Quality Content by WIKIPEDIA articles! 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. It is calculated based on an analysis of the horse's pedigree. 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 French researcher, Lt. Col. J. J. Vullier, published a study on the subject (called Dosage), which was subsequently modified by an Italian breeding expert, Dr. Franco Varola, in two books he authored, entitled Typology Of The Race Horse and The Functional Development Of The Thoroughbred.

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