Undifferentiated bovine respiratory disease (UBRD) or shipping fever is a m
ajor health problem for the beef industry. The economic impact of respirato
ry disease includes therapeutic (treatment and supportive) costs; labor cos
ts for treatment; production inefficiencies because of reduced gain, poorer
feed conversions, and reduced carcass quality; and losses related to chron
ic illness and mortality. This column examines production losses caused by
UBRD and reviews metaphylactic use of tilmicosin phosphate for disease cont
rol.