Until the year 1819 the breed was known as American Mammoth Jack Horse. The name has changed over the import of a Catalan donkey, named Mammoth.Very good producer, he has given its size of 160 cm and that his descendants adopted the name. “Great Eastern” is another standard Catalan, a very elegant model, which marked the race American Mammoth Jack Horse.Later breeders have also brought a donkey of Poitou (Khaki), which with its 162 cm at the withers import new blood in the race.
The American Mammoth Jack Horse (they are not called “donkeys” in the United States) must have a wither height of 150 cm to a minimum. Their ears have a length of 88 cm and 22 cm around the barrel. It is very important that they are well muscled. The American Mammoth Jack Horse dressage is now variable, but often brown with white markings.Their use is also very wide, under saddle or in harness, they are very good figure and as producers are in high demand among farmers mules.American Mammoth Jack Horse, the horse with big ears, a very nice horse for example. The male is called “Jack,” females “Jennett” but never “ass”.