EL PASO, Texas (KVIA) -- The Texas Department of Agriculture Secretary Sid Miller is asking the U.S. Food and Drug Administration to allow ivermectin in medicated livestock feed amid a New World screwworm outbreak. Ivermectin can treat some infections caused by parasitic worms. As of Wednesday, the U.S. Department of Agriculture reported 29 NWS cases in the U.S. -- all in Texas and New Mexico. Nine of those are inactive. Secretary Miller said th…