United States Department of Agriculture • Animal and Plant Health Inspection Service
• Safeguarding American Agriculture
Centers for Epidemiology and Animal Health
Disease Prevention, Treatment
Practices, and Antibiotic
Administration Techniques on
U.S. Swine Sites
In 2006, the USDA’s National Animal Health Monitoring
System (NAHMS) conducted a study on swine health
and management practices from a random sample of
swine production sites in 17 States*. These sites
represented 94 percent of the U.S. pig inventory and 94
percent of U.S. pork producers with 100 or more pigs.
Disease prevention and treatment practices
In addition to vaccinating for certain pathogens, sites
often use treatment regimens of treatments to prevent
and control disease at certain management phases.
From June through November 2006, 74.7 percent of
sites dewormed sows and gilts and 64.0 percent
dewormed boars, which accounted for 60.2 percent of
total sows and gilts and 67.8 percent of total boars
In preweaned piglets, administration of iron was the
most common preventive practice (82.1 percent of sites).
About 9 of 10 piglets (92.3 percent) were on sites that
administered iron at or before weaning. Over 4 of 10
sites (43.5 percent) gave preweaned piglets antibiotics in
feed, but fewer than 1 in 10 piglets (8.7 percent) were on
sites that administered antibiotics in feed to piglets.
Over 8 of 10 sites (85.3 percent) used antibiotics in
feed for nursery pigs, and more than 9 of 10 of nursery
pigs (94.9 percent) were on these sites. The use of
antibiotics in feed was a more common preventive
practice in nursery and grower/finisher pigs than in
breeding animals and piglets.
Arkansas, Colorado, Illinois, Indiana, Io