In 1989 an experiment was started at the Bukhara Breeding Centre, Kyzylkum
Desert, Uzbekistan, to discover whether zoo-bred Przewalski's horses Equus
przewalskii could adapt to semi-wild desert conditions. One stallion and fo
ur mares of different ages were released into a 5126-ha fenced area and mon
itored over a period of 17 years. This paper presents the information gaine
d from the studies concerning home ranges, interactions with other ungulate
species, adaptation to new food resources and comparative changes in daily
activity. The results of breeding and changes in the structure of the grou
p are also presented. The horses appeared to adapt well to the new conditio
ns and there appeared to be no negative effects of interspecific interactio
n with introduced kulans Equus hemionus kulan in the release area.