Day Star was the winner of the 4th annual Kentucky Derby

Kentucky Derby

The Kentucky Derby is a Grade I stakes race for three-year-old Thoroughbred horses, held annually in Louisville, Kentucky, United States on the first Saturday in May, capping the two-week-long Kentucky Derby Festival. The race is one and a quarter mile at Churchill Downs. Colts and geldings carry...

 held at Churchill Downs

Churchill Downs

Churchill Downs, located in Central Avenue in south Louisville, Kentucky, United States, is a Thoroughbred racetrack most famous for hosting the Kentucky Derby annually. It officially opened in 1875, and held the first Kentucky Derby and the first Kentucky Oaks in the same year. Churchill Downs...

 on May 21, 1878. He was a chestnut colt that was foaled in Kentucky

Kentucky

The Commonwealth of Kentucky is a state located in the East Central United States of America. As classified by the United States Census Bureau, Kentucky is a Southern state, more specifically in the East South Central region. Kentucky is one of four U.S. states constituted as a commonwealth...

 and was sired by Star Davis (by the successful Glencoe). His dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

 was Squeeze 'Em who was sired by Lexington

Lexington (horse)

Lexington was a United States Thoroughbred race horse who won six of his seven race starts. Perhaps his greatest fame came however as the most successful sire of the second half of the nineteenth century; he was the Leading sire in North America 16 times, and of his many brood mare and racer...

, a foundation sire of many modern Thoroughbred

Thoroughbred

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed...

 lineages.

Day Star won the Derby by two lengths in an official time of 2:37.25, beating the race record set by Aristides in 1875, and winning a total of $4,050.

In his career, he had 42 starts, 11 wins, 7 places and 5 shows.

A 1910 Daily Racing Form

Daily Racing Form

The Daily Racing Form is a tabloid newspaper founded in 1894 in Chicago, Illinois by Frank Brunell. The paper publishes the past performances of race horses as a statistical service for bettors on horse racing in the United States....

article states that Day Star was sold after his racing career and stood at stud on a western farm, dying at the age of 18 years in 1893.