Breed History | 台北市立動物園資訊網

...facilitatethestandardizationofthebreedtoincludeonlyblackanimals,ultimatelyaminimumof15handstall.Therecordsofbreedingformanyyearsreflected ...

American Mammoth Jackstock are the worlds largest breed of ass. The breed was developed in the United States through the cross-breeding of imported large European breeds (predominantly from Spain), and to a lesser degree, native American and Mexican stock. The breeding of these animals in small numbers precedes the creation of the registry by more than 100 years, well before the Revolutionary War, according to an account written by one of the registrys founders in 1902.

Jackstock were developed out of a need for high quality jacks to sire mules with size, strength and vitality for use in the agriculture and transportation industries. The variety of types of mules required in each of these industries in different regions of the country provided the premise for the types of Jackstock bred in the early years. Breeding of various types of Jackstock has been further influenced by the breeds, or types of mare...