Minecraft wiki entry for Donkey, associated text: Taming depends on the donkey's "temper". They begin with a temper of 0 out of 100. When a player is riding the donkey, a random number between 0 and 99 is chosen. The donkey becomes tame if this number is less than the temper, otherwise, the temper is increased by 5 and the player is bucked off. Temper can also be increased by feeding the donkey.