Dzo Dzo 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),
The Wild Animal Sanctuary donated merchandise, brought in more volunteers, and started a program of sponsoring individual animals. By 2007 the sanctuary was using of its site for rescued animal habitats. By 2010 it had of habitats. In February 2011, the sanctuary, in cooperation with Animal Defenders International, Bob Barker, and the Bolivian government (which had recently enacted legislation outlawing performing wild animals), received 25 lions from circuses in Bolivia that had typically housed the lions in crates for transport. The sanctuary built a fabric covered structure isolated from the main facility to house the lions while they got acclimated to the Colorado climate,