Hershey’s chocolate comes full circle on Pennsylvania dairy farm. The cows love it

PEACH BOTTOM, Pennsylvania — An unmistakable smell swirled in the dusty air during a recent, windy morning on a Lancaster County farm. Red Knob Farm, a dairy operation a few miles north of the Maryland state line, is home to more than 1,500 cows, so there was that odor to contend with, of course. Workers had recently uncovered a large swath of winter rye that had been pickling under plastic too, but there was something more subtle wafting around, beyond the barns. It was a brown powder, piled high inside a commodity shed. If you looked close enough, there were flecks of orange and yellow. It s...