The American Mammoth Jackstock registry (AMJR) was set up in 1888 to monitor and facilitate the breed and by 1915 the American Jack Stock were considered to be the finest in the world. They were developed primarily for producing excellent mules for work and riding. The male donkey is called a jack, and the Mammoth jack should be at least 58 inches (147 centimetres) high, while females are called jennets or jennies and start at 56 inches upwards.

To read more about the breed characteristics and more fascinating history about these lovely animals, you can visit this page on the Livestock Conservancy website.

These enormous donkeys were used to produce incredibly large and powerful mules. A mule is the result of a Jack donkey being mated to a mare (female horse); the offspring is a mule, which is sterile. The common name for a male mule is a “john mule” and the female a “molly mule”. In New Zealand in the 1800s, mules were used for all types of farmwork. As mechanised farm machinery and tractors were introduced, the number of Mules decreased sharply and the decline was also seen in the United States where the American Mammoth breed was almost lost forever.

In the USA using Mammoth donkeys for Trail riding holidays has been widely acknowledged, the merits of the breed are not lost on the many seasoned trail riders who opt to use the strong but calm and intelligent Mammoth donkey as their choice of ride. It is generally accepted that in this breed, the bigger the donkey, the calmer they are. Because they are less skittish than horses, these donkeys make ideal mounts for young or inexperienced riders and for riding for the disabled.

The donkeys come in a variety of colours and each has its own, completely individual personality. They do have two things in common though, their calm and gentle natures and their willingness to please.