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I recently heard that you can spawn a donkey from a horse egg with a random probability so I am curious: how often does this happen?

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According to the Minecraft Wiki:

Horse will spawn 90% of the time; donkey 10% of the time. A foal will be spawned 20% of the time.

The foal will mature into a horse 90% of the time and a donkey 10% of the time.

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    Those numbers don't add up. – GnomeSlice May 13 '13 at 13:44
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    @GnomeSlice A foal can presumably be either a donkey or a horse. In other words: 72% adult horse, 18% baby horse, 8% adult donkey, 2% baby donkey. – dlras2 May 13 '13 at 13:51
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    and 0% dinosaur :( – Alex May 13 '13 at 14:12
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    so the probability of it being a horse and the probability of it being a donkey are mutually exclusive, and the probability of it being an adult and the probability of it being a foal are mutually exclusive, however the whether it is a horse or donkey is independent of whether it is born an adult or foal. If H, D, A, and F represent horse, donkey, adult, and foal respectively, then P(H^A)=P(H)*P(A), P(H^F)=P(H)*P(F),P(D^A)=P(D)*P(A), P(D^F)=P(D)*P(F), P(H)+P(D)=1,P(A)+P(F)=1 – Nil May 13 '13 at 16:36
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A horse spawn egg rarely contains a Donkey. There is a 5% chance the egg will spawn a Donkey, a 75% chance it will spawn a horse, and a 20% chance it will spawn a foal.

Upon maturing, the foal will grow up as either a donkey or a horse. If a foal turns into a donkey, well congrats.

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    Your answer seems to contradict the information provided in the wiki. Where did you get your information? – MBraedley Jul 6 '13 at 12:46

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