About the turn of the 1700's, breeding accounts for Thoroughbred horses were sparse and frequently unfinished, and typically, they would not refer to a horse until the young horse had proven themself worthy. A man named James Weatherby, through his own inquiries and relentless work, and by the collection of his own privately kept pedigree records published the foremost volume of the General Stud Book. He did this in 1791. The first book listed 387 mares, all of which could be traced back to Eclipse. The General Studbook is still available in the UK by Weatherby and Sons. Several years later, as thoroughbred racing became popular in North America the requirement for a pedigree registry for American Bred Thoroughbreds, comparable to the General Stud Book became clear.
In 1873, the foremost American Stud Book was published by Colonel Sanders D. Bruce. This gentleman spent nearly a lifetime studying the pedigrees of American Throughbred horses. He continued the example of the General Stud Book creating six volumes of the register up until 1896 when the project was taken over by The Jockey Club. The integrity of the American Stud Book is the flagstone on which all Thoroughbred racing in North America depends. The first publication of the American Stud Book released by The Jockey Club had a foal amount of approximately 3,000. In 1986 in had risen to an incredible 51,000. Nowadays The Jockey Club runs a powerful new digital system to counter the registration issues posed by the gigantic number of yearly registrations. The Jockey Club is responsible for and operates one of the most sophisticated computer systems in the world at present, with its database holding in excess of 1.8 million horses on a main pedigree file, with names that can be tracked back to the 1800's. In addition to bloodlines, this computer database also processes daily racing outcomes of every Thoroughbred race in North America, not including the capability to process digitally submitted pedigree and racing figures from the UK, Ireland, France and other leading Thoroughbred districts. An extra descendant of Darley Arabian is Diomed; who won the principal running of the Kentucky Derby in 1780. At just 21 years old he was brought over to the US where he produced the male line via his son, Sir Archie.
Thoroughbreds are the preferred choice for track racing. Most thoroughbreds are born somewhere between January and April, however their official birthday is January 1 of the current year. During their first year of development, they are developing size and power with the youth starting his training as a yearling. The horse learns to accept a bridle and a saddle and soon after a rider on his back to break the horse and prepare him for the starting gate and the competition around the track.
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