If you've paid careful attention to your receipts from the feed store, you certainly have noticed that the price of horse feed has crept up to unheard-of levels. And while it might be tempting to assign blame on your local feed manufacturer, larger forces are at work. There are five key factors that account for skyrocketing grain prices: biofuel production, extreme weather patterns across the globe, high oil prices, currency fluctuations, and a surge in global food demand.