Calvados

Jason Wilson, quoting Calvados distiller Guillaume Drouin:

As the fruit ripens on the tree, the cows grazing in the orchard start getting hungry for juicy apples, and begin bumping the trunks to make them fall. What apples do fall, the cows devour off the ground. "The cows are doing my job for me," he said. "Because the first apples they make fall are overripe or diseased or somehow unusable. And once we see them begin to eat those apples, we move the cows from the orchard. That's when I know it's about time for harvest."

http://www.nytimes.com/2014/10/19/travel/in-normandy-young-ambition-stirs-a-traditional-brandy.html

(When I left Borders in 1998, the history buyer and the sports buyer presented to me a bottle of Calvados, which had been discussed I think during one of our many late nights at our desks.)