Donkeys are domesticated animals that will live as much as 30 years, depending on the breed. Donkeys have already been producing milk for 1000s of decades and are doing this in lots of cultures around the globe. Elk milk is among the most costly sorts of milk in the world! http://elgrecocosmetics.com/10-top-benefits-of-handmade-soap-made-with-donkey-milk/