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RE: RE: [RC] Ivermectin - heidi

For really hard to worm horses, that's what I've done as well - but I 
understood (perhaps incorrectly) that the wormer was best given on an 
empty stomach. 

Lif, that was certainly true of many of the old-time dewormers, and I
suspect it is still a better choice.  But what concerns me most about
just putting it in feed is whether or not they get all of it. 
Ivermectin is fairly ineffective if underdosed, so if one were to
resort to putting it in feed, methinks it would pay to add a bit of
extra to make up for spillage, droppage, or just plain sticking to the
container.

I am also concerned by what another poster said about giving 10 ml of
ivermectin liquid to a 1200 lb horse, for the same reason.  The oral
dosage is 1 ml per 110 lbs, and since the effectiveness is so impacted
by underdosing, it might be just about as effective to go pour it down
a gopher hole.  We generally give 10 ml to horses in the 900-1000 lb
range, just to make sure they get an effective dose if any dribbles
out.  I'd sure rather use an extra ml per horse than not get the job
done...  With the 500 ml vials, that ends up being only about 30 cents
more per horse.  For a herd of 40, that's about the cost of one tube at
the feed store...

Heidi


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