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The Jockey Club gives all Thoroughbreds in the northern Hemisphere the birthday of January first and in the southern hemisphere the birthday of September first of their birth year to make it easier to sort the horses into races. They still have their actual birthdays written onto their registration records but they just use a general birthday to make things easier.

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12y ago
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4mo ago

Thoroughbred horses in the Northern Hemisphere are considered to have the same birthday because they all celebrate their birthday on January 1st regardless of their actual birth date. This standardizes the age calculation for competition and breeding purposes within the industry.

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14y ago

Because thoroughbreds are raced according to age (IE- the Kentucky Derby is a race for 3 year olds), they all have the same "birthday" of January 1st of the year they were born in. This alleviates confusion when entering horses in races since all horses born in a certain year are eligable for the races for their age group. For example, all horses born in 2010 will race as a 2 year old in 2012 in any 2yr old race regardless of when they were born in 2010.

Most breeders will try to breed so their foals are born as close to January 1st (but not before) as possible so they are not handicapped when its time to race. If a horse is born on 31 Dec it is automatically a year old the next day and there for will technically be a year younger than the other horses it will race against as a 2 and 3 year old. This is not desirable in racehorses.

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16y ago

This only applies to racing Thoroughbreds, I think its because they want the horses to be as old as they can to race

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Q: Why do thoroughbred horses have the same birthday?
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