18,000 cows.... say each one is producing somewhere between 75-90 lbs milk daily.... 8.6 lbs of milk per gallon.....  each cow was producing between 8.6-10.4 gallons of milk daily...... x 18,000 cows is 154,800 - 187,200 gallons of milk no longer produced daily.... i drink about a gallon of milk every 5 days or so.... so, based on that, milk supply for about 774,000-936,000 people is no longer produced.

Hmmmm......