The domestication of horses and donkeys dates back to 4000-3000 BC. It first started in Africa and the Middle East.
Nowadays, horse and donkey breeding is carried out in much smaller and even closed areas compared to the old times, making them very vulnerable to nutritional metabolic diseases.

It should not be forgotten that Equidae group animals that need to be fed specially for the living and performance area.
They need special digestive system and special support for performance.