STRAFFORD, Mo. -- Traffic on Interstate 44 was disrupted Tuesday after a westbound semi-trailer truck ran into the back of a cattle trailer being pulled by a truck about 8:30 a.m. Tuesday. A cow in the trailer died. The Missouri State Highway Patrol says the semi was carrying pool chemicals, including hydrochloric acid. The chemicals spilled and caught fire, sending black smoke high into the air. Traffic was closed in both directions for a while. By 10 a.m., the eastbound lanes were open. By noon,