‘Hidden’ Form Of Ileitis In Swine Poses Big
ORLANDO, Fla. Swine researchers attending
the American Association of Swine Veterinarians’
annual meeting in Orlando, Fla., presented a new
approach to a problem pork producers may not
even realize their animals are suffering from
subclinical ileitis a disease that seems invisible,
but inflicts noticeable damage.
Unlike clinical ileitis, where producers see diar
rhea, feed passage, gauntness, and even death, subc
linical ileitis presents no visible signs. However, pigs
suffer depressed performance due to Lawsonia in
tracellularis infection, the cause of all forms of
ileitis.
Dr. Roberto Guedes, a swine researcher who spe
cializes in ileitis at the Federal University of Minas
Gerais in Brazil, says, “Based on high seropre
valence in swine herds around the world, it seems
most populations are infected with subclinical
ileitis.” A NAHMS serology study supports this
assertion for U.S. producers. It found L. intracellu
laris was present in 96.2 percent of tested herds.
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New Approach Unveiled To Help
This is in contrast to only 37 percent of grow-finish
operations found to have clinical ileitis in the
USDA’s Swine 2000 survey.
Trial data previously presented by Dr. Nate
Winkelman, a swine veterinarian from Morris,
Minn., underscored the serious impact subclinical
ileitis can have on operations. He reported pigs with
subclinical ileitis showed a 30 percent decrease in
average daily gain with 23 percent worse feed effi
ciency an impact that could devastate pig flow
and profitability.
Dr. John Deen, a University of Minnesota swine
veterinarian and researcher, tells producers and
veterinarians not to underestimate the negative
impact ileitis can have on pig performance and pro
fitability. “Ileitis is often not as predictable as respi
ratory disease, but in many cases, more significant
in the amount of insult on average daily gain in in
fected pigs,” he says. “That’s why producers need
to look at interventions that reduce growth varia
tion.”
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