As Acromion has already pointed out, mare's milk is absolutely vital for the Mongolian nomads, and fermented mare's milk, Kumiss, was probably vital for the ferocity of the Hun and Mongolian armies of old.
Another thing that irks me in this article is the paragraphs about the Aurochs. The 's' in 'Aurochs' does not indicate plural form, so a single Aurochs is still an Aurochs. The 'ochs' part is the same as the English 'ox', and means exactly the same.