Four days ago drove out to the pasture and foud a dead 450lb. steer dead. I cut his leg open and checked for blackleg and didn't see anything that looked weird. put out hay day before and he looked fine. I kind of blew it off and checked them today to find another dead calf. came back with a little later and found a calf that was skinny and sick looking . it had real bad scours. What's wrong? How can I treat it so it doesn't spread. Please help!!!!!!!!