When you plant oats, barley, etc, do you have to buy special seed grain, or just buy a bag of grain and plant it. I want to plant grain in some pasture for fall pasturing cattle, goats, and hogs. Also what would I need to harvest grain? I have a 40hp tractor. I want to grow my own grains for my hogs. But I am trying to find out what would be the most economical (Cheaper to start) grain to grow. Corn or conventional grains?