|A dzo acting as a pack animal en route to Mount Everest|
|Species:||B. grunniens × B. primigenius|
A dzo (Tibetan མཛོ་ mdzo) (also spelled zo, zho and dzho) 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. In Mongolian it is called khainag (хайнаг). There is also the English language portmanteau term of yattle, a combination of the words yak and cattle, as well as yakow, a combination of the words yak and cow.
Dzomo are fertile (or, fecund) while dzo are sterile. As they are a product of the hybrid genetic phenomenon of heterosis (hybrid vigor), they are larger and stronger than yak or cattle from the region. In Mongolia and Tibet, khainags are thought to be more productive than cattle or yaks in terms of both milk and meat production.
Dzomo can be back crossed. As a result, many supposedly pure yak or pure cattle probably carry each other's genetic material. In Mongolia and Tibet, the result of a khainag crossed with either a domestic bull or yak bull is called ortoom (three-quarter-bred) and an ortoom crossed with a domestic bull or yak bull results in a usan güzee (one-eighth-bred).
- Mummolo, Jonathan (August 11, 2007). "Yattle What?". The Washington Post. Retrieved January 3, 2017.
Mentzer, who grew up farming in Loudoun County, and his partner, Jim Dumbrell, a retired British oil and gas pipeline consultant, are breeding yattle -- a cross between cows and yaks.
- National Research Council (1983). Little-Known Asian Animals With a Promising Economic Future. Washington, D.C.: The National Academies Press. p. 34. doi:10.17226/19514.
- Mason, Ian (March 2002). Porter, Valerie, ed. Mason's World Dictionary of Livestock Breeds, Types and Varieties. West Sussex: CABI. p. 122. ISBN 085199430X.
- David B. Madsen; Fa-Hu Chen; Xing Gao (3 July 2007). Late Quaternary Climate Change and Human Adaptation in Arid China. Elsevier. p. 207. ISBN 978-0-444-52962-6. Retrieved 3 June 2012.
- Bataagiin Bynie: Mongolia: The Country Refort (sic!) On Animal Genetic Resources, Ulaanbaatar 2002, p. 11
- Tsering, Diki (2002). Dalai Lama, My Son. Penguin Books. ISBN 0-7865-2260-7.
- Takase Hisabumi, Kh. Tumennasan et al., Fertility Investigation in F1 Hybrid and Backcross Progeny of Cattle (Bos taurus) and Yak (B. gruniens) in Mongolia. : II. Little variation in gene products studied in male sterile and fertile animals, in: Niigata journal of health and welfare Vol.2, No.1, pp. 42-52
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