Which of the following is considered the most popular feed for horses?

The most popular feed for horses is hay, which provides essential fibers, nutrients, and roughage necessary for a horse's digestive health and overall well-being. Hay is particularly important as horses are natural grazers and require a diet high in fiber to maintain proper gut function and to prevent digestive issues.

Oats, while a widely used grain feed for horses and known for their high energy content, are not as commonly relied upon as hay. They are often used to supplement a horse's diet but do not serve as the primary food source due to their high starch content and the potential for digestive upset if fed in excess.

Corn and barley are also grain feeds but are less popular than hay for primary feeding. While they can provide energy, they are typically used in specific dietary formulations or supplements rather than being a staple feed like hay.

Thus, hay holds the title of being the most popular feed choice for horses due to its suitability for their natural dietary needs and the role it plays in maintaining their health.