Move over, organic milk. Health-conscious consumers are increasingly choosing a new bovine beverage: Grass-fed milk. Derived from cows fed mostly grass—not corn or soy—the pricey beverage is capturing a growing market share among consumers, The Wall Street Journal reports. […] Branded “Grassmilk,” it has cream on top and is lightly pasteurized with heat. A half-gallon sells for close to $6, more than a dollar more than the average price of organic milk and more than double the price of traditional milk. …