The Rural Voice, 2002-06, Page 411
It's frustrating; you don't want to
abandon hope, but some people may
not understand what's going on in
. that pen."
"If good body condition can be
maintained, there is hope."
Why is the disease showing up?
Bateman offers several theories, but
admits that there is no clear answer.
One thing noted was the evidence of
BVD virus in the animal. "There's a
step missing, though, because they
don't know if the 50 per cent out
there doing fine have been exposed
to BVD. It's possible BVD has
become more pathogenic, but stories
are not complete."
Another theory is whether or
not there has been a change
in mycoplasma. "We need to
look and see if we've changed
something that's allowed it to
become more virulent."
Bateman theorized about whether
the "excellent control of shipping
fever" has given mycoplasma new
power. Quoting Eugene Jansen of the
University of Saskatchewan,
Bateman says, "Nature abhors a
One theory is there has
been a change in
mycoplasma
vacuum."
"Once you wipe something out,
minimize its impacts, something else
comes along."
It is possible that a resistance to the
antibiotics has been developed. Or
Bateman ponders, has less
monitoring given disease an
opportunity to appear?" It used to be
when an animal was sick if the
condition hadn't changed in 24 hours
we changed the antibiotic. Now we
give long-lasting antibiotics and
don't monitor the response as
closely."
Admitting that there are a lot of
questions behind any of these
concepts, Bateman says, "it would be
foolish to ignore things we know to
be different."
With no clear answers on what has
caused the problem, researchers are
equally challenged on finding ways
to control it. Bateman suggests
minimizing the respiratory diseases.
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JUNE 2002 37