In essence, vomiting is a basic need for humans and animals. Because it is logical that substances that the stomach does not accept are thrown away. However This is not the case with horses.
So why?
Horses have 3 different mechanisms that prevent them from vomiting.

Thanks to the first of these, the peristalsis mechanism, their esophagus contracts rhythmically. In this way, their bodies move the food they consume along their neck area. It forces it to reach the digestive system.
Secondly, horses have a cardiac sphincter mechanism. This is them their stomachs that you are incredibly powerful is the indicator. In other animals, vomiting occurs when there is some pressure from the stomach, but in horses, the pressure on the stomach still does not allow them to expel food.
Third, horses’ esophagus is connected to their stomach at such an angle that even if pressure is applied to the stomach, the cardiac sphincter (the connection between the lower esophagus and the stomach) will not open, let alone open. closes tighter.
Additionally, the equine digestive system does not allow food to travel in the opposite direction as intended.

Plus, they’re decent They have a large rib cage It also prevents them from vomiting. Because horses’ stomachs are located in a very deep part of their body, they do not have a strong abdominal muscle structure that can put sudden and excessive pressure on the stomach.
On the other hand, scientists also suspect that the gag reflex evolved as a way to expel toxins. However, because horses are very picky eaters, their need to vomit is great It is also possible that they never evolved quite high.
In summary: the body of horses, with different mechanisms that prevent them from vomiting is equipped.
Sources: Strathorn, IFL Science
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