The earliest archaeological evidence of horse milking, harnessing, and corralling is found in the ∼5,500-year-old Botai culture of Central Asian steppes (Gaunitz et al., 2018, Outram et al., 2009; see Kosintsev and Kuznetsov, 2013 for discussion). Botai-like horses are, however, not the direct ancestors of modern domesticates but of Przewalski’s horses (Gaunitz et al., 2018). The genetic origin of modern domesticates thus remains contentious, with suggested candidates in the Pontic-Caspian steppes (Anthony, 2007), Anatolia (Arbuckle,
Nowadays, archaeologists distinguish at least three Bronze Age pictorial traditions on the basis of style, and demonstrate some parallels in the material culture. The earliest is the Yamna–Afanasievo tradition, which is characterized by the symbolic depiction of sun-headed men and animals. Another tradition is a record of the Andronovo people (Kuzmina 1994; Novozhenov 2012), who depicted in it their everyday life and the importance of wheeled transport (Novozhenov 2014a, b). Although petroglyphs
About two months ago I stumbled upon a gem in archaeological studies related to Proto-Indo-Europeans, the book О скипетрах, о лошадях, о войне: этюды в защиту миграционной концепции М.Гимбутас (On sceptres, on horses, on war: Studies in defence of M. Gimbutas’ migration concepts), 2007, by V. A. Dergachev, from the Institute of Cultural Heritage of the Moldavian Republic.