NAVLE® Question of the day

A group of yearling stocker cattle on summer pasture are presented for coughing in approximately 30% of the group. The owner has treated the coughing animals with antibiotics with no response.

When the herd is gathered for examination the coughs worsen and some animals become dyspnic. Some of the cattle look thin and have rough haircoats.

Necropsy of one animal shows the following.

What is the appropriate action for this herd?

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