I got some feeders, most are around 350lb that are coughing. Their on dry pasture and dry hay. But they cough alot. They are eating good and their poop is tight. Any ideas? I lost 4 a few weeks back. They acted weak, started foaming at the mouth, couldnt stand, and finally died. Have no clue what they had. The vet gave said they were immuned to LA200 and gave us DROXIN. Said it was the best stuff availibe. They have all had it, but 4 died. The reast seem healthy but still coughing. Im somewhat new to cattle. Is there a good fix all vaccination I could give all my new incoming cattle? Thanks