A dzo (Standard Tibetan: མཛོ་, romanized: mdzo) is a hybrid between the yak and domestic cattle.

The word dzo technically refers to a male hybrid, while a female is known as a dzomo or zhom.

There is also the English portmanteau term of yattle—a combination of the words yak and cattle,[1] as well as yakow[2][3]—a combination of the words yak and cow.

[6][7] Dzos inherit two distinct protein types, one from each parent, leading to alterations in their mitochondrial structure and function.

[8] Consequently, this adaptation significantly enhances the dzo's capacity to thrive at higher altitudes compared to either parent.