In 1957, a wild-caught mare captured as a foal a decade earlier was introduced into the Ukrainian captive population. This would prove the last wild-caught horse, and with the presumed extinction of wild population, last sighted in Mongolia in the late 1960s, the captive population became the sole representatives of Przewalski's horse. Genetic diversity received a much needed boost from this new source, with the spread of her bloodline through the inbred captive groups leading to their increased reproductive success, and by 1965 there were more than 130 animals spread among thirty-two zoos and parks.