This theory is very widespread and diffused in the West and it can be considered as the continuation of the influence of "Arianism". This theory alleges that the Indo-European people were settled in the entire Asia extending towards the Lake Baikal and that they were actually "nomadic people" (from steppe lands!). This theory also asserts that the horses were domesticated by them for the first time in the history and that the world had become acquainted with the art of riding horses by means of them. This emphasis of the Western people over the issue of horses is doubtlessly based on the fact that the domestication of horses and riding horses had constituted an incredible step for the cultural history of the mankind. Therefore, it would be possible to attribute the culture that developed in the steppe lands to the Indo-Germanic people. "Equus Przewalsky" that was extracted in Chungaria in the form of fossils were indicated as the evidence of the domesticated horse in this region. Against this Indo-Germanic theory, it was reminded that there were various species of horses rather than a specific breed of horse since the ancient prehistoric times (For example; "hipparion" and "equus caballus" species in the period of "Neolithic Age" in the region of Ordos in China). Similarly, it was stated that it was possible that the horses could be domesticated by various tribes in various places rather than a single community.
Meanwhile, let's state that the saddle horse that was used by the warrior shepherds in the Steppe culture was not the species of Przewalsky. Those horses used were the species of western steppe lands that had "small bodies, short heads and broad foreheads".
The first archaeological remains of this steppe warhorses that were used by the Hun cavalrymen pertained to the period of Afanasyevo culture (2500-1700 BC). This culture was related with the ancient Turkish Altay culture. There must have been a need for the domestication of the horses and this need was doubtlessly required within the steppe tribes that bred animals for the first time in the history. Therefore, the first usage of horses by mankind -although it constitutes the beginning point- is not a significant ground. The main issue is the domestication of horses as the saddle horses. The main action that played a role in the Steppe culture was horsemanship.
It is obvious that the need for a medium of transportation like horses had come into existence as a result of the obligation for wandering around very extensive regions with the most possible high speed of life rather than the "settled" communities. The steppe warhorses extended towards the west and it has been observed in the region of San-si that is considered as the first region of breeding warhorses in China. The Chinese people had learned to ride horses from the Asian Hun people in the years of 300s BC.