Horse
Depending on breed, management and environment, the modern domestic horse has a life expectancy of 25 to 30 years. Uncommonly, a few animals live into their 40s and, occasionally, beyond. The oldest verifiable record was "Old Billy", a 19th-century horse that lived to the age of 62. In modern times, Sugar Puff, who had been listed in "Guinness World Records" as the world's oldest living pony, died in 2007 at age 56.
Jeju horse
The Jeju horse exhibits a range of colors, which determine the names of the types, along with the characteristics of each body part. The coat color also forms a standard to distinguish each type.
Horses with the same coat color are often named differently depending on the tone of the color. The position of a white spot also creates other names as follows:
A stallion reaches suitable breeding age by roughly three to four years old, and a three-year-old mare is in the best breeding condition during the spring. The official breeding period lasts for 25 years. Jeju horses belong to long day breeders, whose mating occurs from March to August in Jeju. The estrous cycle is 20 to 24 days (e.g. 22 days on average), and the estrus usually lasts 4 to 11 days (e.g. 7 days on average). Within 7 to 10 days (e.g. 8 days on average) after delivery, the mare undergoes another estrus, which reoccurs every 22 days.