In August, the ranchlands spreading over the boot of Louisiana were dotted with hundreds of cows and calves grazing on a smorgasbord of tall marsh grasses. But Hurricane Isaac took all that away, turning some of the best cattle country on the Mississippi River delta into brackish, foul-smelling floodwater stretching for miles. A lot of the livestock raised here by a handful of ranching families drowned in Isaac’s storm surge along with birds, snakes and other wildlife. The storm overwhelmed weak levees protecting this farm country south of New Orleans