Animal Nutrition. Are there specific grains that should be avoided for active horses? February 5, 2026 by Riding For active horses, it’s generally best to avoid moldy or dusty grains in order to prevent forage poisoning and respiratory complications. While oats are typically the preferred grain for horses due to their bulk, other grains like corn, barley, wheat, and milo can be used as more affordable alternatives. It’s important to ensure that any […] Read more »