Disease of the respiratory tract is a major problem for cattle and it continues to cause serious economic losses for producers. Bovine respiratory disease (BRD) causes increased death losses as well as medication costs, labor, and lost production. Many different infectious agents may cause similar clinical signs. Multiple agents are often involved in the development of BRD.
Bagley, Clell, "Bovine Respiratory Disease" (1997). All Current Publications. Paper 439.