Reproductive characteristics of Burchell's zebra mares are described using data collected from captive and free ranging animals and the reproductive tracts of 310 mares shot during a game cropping campaign. The pubertal interval in zebra mares ranges from age 16 to 22 months, succesful mating occurring for the first time at 23 months of age. Full reproductive capacity is attained at three years. Zebra mares are seasonally polyoestrous, with an average of 85 of all mating and foaling occurring during the wet summer months (October to March).