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A dzo (Tibetan མཛོ་ 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''. Alternative Romanizations of the Tibetan names include dzho, zho and zo. In Mongolian it is called khainag (хайнаг). There is also the English language portmanteau term of yakow; a combination of the words yak and cow, though this is rarely used. 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.〔(Bataagiin Bynie: ''Mongolia: The Country Refort (sic!) On Animal Genetic Resources'', Ulaanbaatar 2002, p. 11 )〕 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).〔〔(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 )〕 ==See also== *Bovid hybrid *Yakalo 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dzo」の詳細全文を読む スポンサード リンク
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