The world’s largest breed of ass, the American Mammoth Jack stock was developed in the U.S. through the selective cross breeding of imported European stock with local Native American and Mexican animals.
Small time breeding of these animals was done for more than 100 years prior to the development of an official registry in 1888.
This is an animal developed based on the needs of people in various areas, but mainly for agricultural & transportation needs. The intention was to create a larger & stronger animal more capable of heavy workloads.
Selective breeding helped to preserve important traits, but was often limited to what was available to use. However initially the registry attempted to standardize the breed to only include black animals a minimum of 15hands tall.
Over the years, these this rigid type lines have blurred and the breed encompasses a number of types.
Jacks must be a minimum of 14.2 hands
Jennets must be a minimum of 14 hands
Head is well shaped & tapered to a round muzzle
Large, wide-set eyes & long, upright ears
Neck should be muscular but not too thick & well proportioned
Good width, depth & length of body
Strong loins & a full hip
Legs should be strong and thick
Feet are large & well cupped
Initially they were to be black with a mealy / pangare gene however cross breeding has created more colors including sorrel.
Willing and tireless
Mild mannered and kind