> Milk, which uses Alfalfa for cow food, would be in short supply in a  few years.

I don't have the statistics, but a large percentage of dairy feed is corn. "Hoard’s Dairyman," Fort Atkinson, WI says:

> From the stony ground of New England to the rich, black loam of the Midwest, to the alluvial soils of California's Central Valley, farmers love to grow corn. Dairy farmers have valued corn for its energy and fiber since the earliest days of America. But it wasn't until the mid-20th century when both the development of synthetic fertilizers and automated harvesting paved the way for dairy farmers to really fall in love with corn.

> Genetic selection and hybridization, along with improvements in planting, fertilizing and harvesting technology, have made it possible for corn to produce more calories and digestible energy per acre for humans and animals than any other forage. The modern harvesting of corn and its natural ability to ferment and stabilize into a storable feedstuff with high nutritional value has resulted in millions of tons of corn being ensiled worldwide each year. 

> It's not uncommon for dairies to feed 75 to 100 pounds of corn silage to their cows and little or no hay crop. This equates to 22 to 33 pounds of dry matter with moisture at 70 percent. For many cows, this represents 50 percent of their daily feed intake ...

PLB

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