Farmers only use corn as feed due to massive subsidies from government in the first place so that corn can essentially be grown at a loss. Without government subsidies for corn almost all cows would be grass fed as they are naturally meant to be.
This is merely a side rant of course. Government creating false demand will always drive up prices.
Not to mention The Federal Reserve driving up prices on everything!
When it comes down to it, all government meddling drives up prices.