Did you know that airag is a drink made of fermented mares milk which is considered to be a staple food of central and eastern asian steppes?
An alcoholic drink with a unique, sour taste and consistency of kefir, it is also quite nutritious, being able to sustain a horseback nomad for a few days
Since regular horses do not exist in Umamusume, it is unlikely that airag exists there either or does it?