According to the British charity, The Donkey Sanctuary, the skin is used in a traditional Chinese remedy known as ejiao.
The collagen extracted from the donkey skin is mixed with herbs and other ingredients to form a pill or liquid for consumer use. Users believe it treats various conditions such as bleeding, dizziness, insomnia and a dry cough. Ejiao can also be found in some beauty products.
There have been attempts to ban the killing of donkeys, which is yet to be passed into law.
"The major beneficiary in this trade is the donkey [skin] merchants in China," says Muhammad Datti, one of the federal lawmakers supporting the proposed ban.
"This animal is facing extinction [in Nigeria], and it cannot breed in large numbers because of the very low rate of fertility."
The Donkey Sanctuary estimates that around 4.8 million donkeys are killed each year for their skins, using "unregulated, inhumane and unsanitary" methods.
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