Check it Out!
Re: EPM in feeds?
In a message dated 2/21/00 10:23:05 PM Pacific Standard Time,
<< Just read this one...isn't steam rolling a normal processing? Does this
mean that the protozoa is fairly fragile in the heat?...the grain wouldn't
have to be nearly sterilized in order to kill it? Janie (my mare with EPM)
was fed an extruded feed...looking back, I don't know if there was enough
heat in the processing to make it pass. It was a moot point living near
the woods, however. >>
Yep, as I discussed in my last post, it doesn't take much to kill the
organism, and the extruding process pretty well cooks the feed. Where you
live, if you were feeding an extruded feed, I'd suspect your mare got it from
hay or pasture--would be a more likely source anyway where you have opossums.
The Willamette valley has an exposure rate of better than 50% by serology
(remember that "positive" serology only means the horse has been exposed, not
that he actually "has" the disease) and in some areas of Kentucky, studies in
TB youngsters have shown exposure rates over 90%. The vast majority of these
horses never do have clinical EPM--those that don't get it have some
combination of healthy meninges so that the organism does not have a "ready"
area to set up housekeeping and a good immune system to simply deal with the
organism directly. Barry Grant tells me that clinically, they see many of
the EPM cases in horses with either mild (or previously undetected) cases of
Wobblers Syndrome or in horses that have had some sort of mild spinal
trauma--the theory is that the protozoa is opportunistic and has a much
better chance of attacking tissue that is already somewhat damaged from some
other process. Others have mentioned that they feel many cases are in horses
that are a bit less immunologically competent than their peers. I'd suspect
both of these things are variables that would increase the risk.
Check it Out!
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