Mating occurs throughout the year, but peaks in the wet season. Females reach sexual maturity at about two years, and males at four to five years. A female can remain in estrus for three days, and the estrous cycle is 21–26 days long. As in all antelopes, mating occurs at a time of food abundance. In some areas distinct breeding seasons exist. In southern Africa, females have been seen giving birth from August to October, and are joined by the males from late October to January. In Zambia calves are born in July and August.