A female donkey is called a "jenny" or "jennet." There is some speculation that the name "jenny" for a female donkey came about hundreds of years ago as a counterpart to the male donkey term, "jack." Both male and female donkeys are called "asses."
Jennies are pregnant for 12 months before giving birth to their foal. Jennies can be mated with other species of horse to produce different types of offspring. A female donkey mated with a male horse produces a "hinny." A male zebra and a jenny results in a "zebrass" or "zedonk." All offspring from these unions are sterile.