Open access Ancient DNA shows domestic horses were introduced in the southern Caucasus and Anatolia during the Bronze Age by Guimaraes et al. Sci Adv. (2020) Vol. 6, no. 38, eabb0030.
Here is a good summary:
Our study of ancient equid remains from Anatolia and the southern Caucasus covering ~9000 years of the Holocene analyzed the dynamics over time of mitochondrial lineages and tested the hypothesis that Anatolia was a center of horse domestication. We were able to identify mitotypes characteristic of local Anatolian wild horses, which were regularly exploited in the early and middle Holocene. However, we identified a
… Read the rest “Origin of DOM2 closing in on the Pontic-Caspian steppes”
Open access Tracking Five Millennia of Horse Management with Extensive Ancient Genome Time Series, by Fages et al. Cell (2019).
Interesting excerpts (emphasis mine):
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,
… Read the rest “Yamna the likely source of modern horse domesticates; the closest lineage, from East Bell Beakers”