Dean Foods effectively slammed shut the door on milk from cloned cows recently.  Dean is the 800 lb gorilla of the dairy industry, controlling something like 30% of the milk business in the U.S.  If the Mayfields, McArthurs and Meadow Golds from coast to coast can tell consumers their milk comes from cows designed by nature, you can bet that competitors in each market will need to be able to do the same.