It is thought that there were infusions of oriental stock by the Turks during the Ottoman Empire, after which more Tarpan blood was added to make the modern Bosnian Pony breed.
One of the first experiments in this regard was published in 1906 by James Cossar Ewart, who obtained a "tarpan-like" horse by crossing a Shetland mare and a black Welsh pony.
The Heck horse aimed to recreate the Tarpan (the true European Wild Horse, ancestor of all European domestic horse breeds), and the Heck cattle, aimed to recreate the aurochs, the wild cattle of the European forest.