Which of the following is a commonly fed grain for horses in Canada?

Corn is a commonly fed grain for horses in Canada due to its high energy content and ease of digestion. It is often used as a key ingredient in many horse feeds and supplements, making it a staple in equine diets across the country. Corn provides essential carbohydrates, which are crucial for horses, especially for those that require higher energy levels for activities such as training or competition.

While rye, wheat, and rice can be used in horse feeding, they are not as prevalent as corn. Rye is generally considered less safe due to the potential for mycotoxin contamination, which can lead to health issues in horses. Wheat may also be less favored because it can cause digestive disturbances in some horses. Rice is typically not a grain that is readily fed to horses, as it is not as nutritionally balanced for them compared to corn. Therefore, corn stands out as the most common and appropriate grain for equine nutrition in Canada.