Yak Milk (Dri Milk)

Yak milk, known as dri milk in Tibetan, is the milk of the female yak (Bos grunniens), a long-haired bovine native to the Tibetan Plateau and Himalayan highlands. It is the foundational dairy of Tibetan, Nepali, Bhutanese, and Mongolian cuisine, underpinning iconic preparations like butter tea and the region's distinctive hard cheeses. The milk's most defining characteristic is its fat content—typically 5 to 8 percent, roughly double that of most commercial cow milk—which makes it exceptionally efficient for churning butter and lends extraordinary richness to every application. Flavor-wise, yak milk is faintly sweet with a subtle mineral tang imparted by the highland grasses and herbs the animals graze on, creating a more complex taste than lowland dairy.

Unlike conventional dairy, yak milk is produced in small quantities by animals that roam at extreme altitudes. A single dri yields only one to one-and-a-half liters per day, compared to the gallons a dairy cow produces, which explains its scarcity outside the Himalayan region. The milk is highly seasonal: production peaks in summer and early autumn when yaks are grazing at their highest elevations, then drops sharply in winter. Fresh yak milk keeps only one to two days under refrigeration, so traditional preservation methods—drying into cakes or powder called pkama, and fermenting into cultured dairy—were developed to extend its usability through harsh winters. These traditional forms travel well and reconstitute reliably, making yak dairy a year-round staple despite the seasonal milk supply.