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What Is a Dzo?

By Sandi Johnson
Updated Jun 04, 2024
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Dzo is the Tibetan word for the male offspring of a cross between domestic cattle and yak. The dzo is a common livestock animal in Tibet, with large herds of yak and mixed hybrids sprinkled throughout the Tibetan mountain regions. Physically, dzo and their female counterparts, known as dzomo, are smaller than yaks, but larger than domestic cattle. Although not an absolute, a dzo will typically present with facial features resembling a cow, but with the shaggy coat and horns characteristic of a yak. Similar bovid hybrids are also common to Mongolia and areas surrounding the Himalayas, known there as khainag, zho, or zo.

Tibetans, Mongolians, and other cultures use dzo and dzomos as pack animals in high mountain regions, much the same as purebred yaks. Cultures living in high elevations, such as the Himalayas, rely on animals with the strength and physiological characteristics required to carry heavy loads for long, arduous journeys through rugged mountain conditions. Animals, therefore, must have the ability to breath the rarefied air of high elevations, as well as the dexterity to navigate difficult mountain terrain. Compared to purebred yak, dzo are more agile, owing to their cow ancestry, but without the pulmonary challenges cattle suffer at high elevations.

In addition to being pack animals, herders also use dzo and dzomos for more traditional livestock purposes. Since dietary requirements of yaks, cattle, and hybrids are the same, upkeep for large herds is relatively simple and allows herders to maximize the usefulness of each animal. Milk and meat production from bovid hybrids is reportedly higher than purebred yaks. Meat, milk, and hides not only provide sustenance for herders and their families, but commodities for resale to others.

For breeding purposes, dzo have little to no value to herders or professional breeders. Male offspring are sterile, much like mules. On the other hand, unlike mules and dzo, dzomos are able to bear young and can be bred back to purebred yak or cattle. Serious breeders and herders will cross a dzomo back to a purebred in an effort to secure only the best yak and cattle traits in future offspring.

Researchers have studied yak and domestic cattle in the Himalayan region in an effort to determine how and why yak have adapted so well to altitudes above 10,000 feet (3,048 meters). Studies show that yak have low pulmonary artery pressure, a genetic adaptation passed on to hybrid offspring. Such results highlight a possible reason why yak, dzo, and dzomo do not suffer the same pulmonary hypertension as cattle when exposed to the rarefied air of high elevations. Hope for answers to human pulmonary function and adaptation lies in understanding how bovine, camelid, and similar species adapt on a genetic level to such conditions.

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