Can you breed brother donkey to sister donkey?

Answer 1

Yes they only breed with their breed.

The above is only partly true. A donkey is a breed, or species (Equuis asines), It, therefore, can breed true - that is, a male and a female donkey will produce another donkey.

However, a donkey can interbreed with a horse as follows:

A female horse (mare), and a male donkey will produce a mule.

A male horse (stallion), and a female donkey will produce a hinny.

Answer 2

Yes, This is where new donkeys come from. You are confusing a donkey with a mule - which is the offspring of a donkey / horse pairing. And no they cannot breed .....

Answer 3

You should not breed a brother donkey to a sister donkey. This can result in serious issues in the offspring of the pair.