The World Thoroughbred Rankings are the official end of season assessment of the top thoroughbred racehorses.

Until 2008, two editions of the Rankings were published each year, one in January and one in August, corresponding with the world's two racing seasons. The January publication covered those horses which either raced in or were trained in countries whose racing season ran from 1st January to 31st December, while the August edition comprised those horses which either raced in or were trained in countries whose season ran from 1st August to 31st July (1st July to 30th June in South America). To merit inclusion, a horse must have been rated at 115 or above by the World Thoroughbred Racehorse Rankings Conference.

From 2008 onwards, there will be one annual edition, published in January and titled the World Thoroughbred Rankings (WTR). The WTR will comprise all horses which have run during the calendar year, and which have been rated at 115 or above by the World Thoroughbred Rankings Conference.

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The World's Leading Horses lists the top thoroughbred racehorses to have run anywhere in the world, assessed on the form they have shown in the previous six months.

The IFHA publishes the World's Leading Horses at various points in the year, to show the current star performers in the racing world, and how they compare.

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