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Clearance is a bit of a misnomer. They way this is typically discussed is in
therapeutic levels, allowable levels, and detectable levels.

Eg, bute is therapeutic for only ~24 hours. It's suggested withdrawal time
for USEF is 12 hours. It detectable time can be up to 3 weeks.

http://www.thehorse.com/viewarticle.aspx?id=13653

http://www.usef.org/documents/competitions/2007/2007DrugsMedsGuidelines.pdf


> On May 5, 2009, at 1:12 PM, steveb@xxxxxxx wrote:
>
> > Yucca is on the AERC list.  If you go to AERC.org, then to the 
> > membership drop-down, then rules & regulations, the appendices list 
> > the banned drugs.
> > I'm not sure where I got this information, but I remember that Yucca 
> > clears from the horses system in three days.  Someone else 
> might have 
> > good information on this.  It's not on the list on the AERC 
> site that 
> > tells how long compounds remain detectable.
> >
> > Steve
> >
> > On Tue, May 5, 2009 12:27 pm, Elizabeth Walker wrote:
> > >
> > > Evidently.
> > >
> > >
> > > I contacted Mellisa Ribley about it, as I recently switched 
> to Triple 
> > > Crown.  (Didn't even notice the yucca until it got pointed out.) 
> > > According to the answer I got - Yucca is on the prohibited 
> substance 
> > > list, as it has anti-inflammatory properties, and there is 
> no way to 
> > > tell how much of it is in the feed in a non-FDA approved 
> feed.  "The 
> > > recommendation is to use these products/feeds with caution during 
> > > competition as it is the rider/iowners responsibility as to what is 
> > > present in the horse during the time of competition."
> > >
> > > I haven't contacted Triple Crown yet, though someone else reported 
> > > that their rep said it "wouldn't test".  The yucca isn't added for 
> > > its anti-inflammatory action.  It is added because it will 
> bind with 
> > > ammonia in the large intestine, and be excreted in the 
> manure, rather 
> > > than in the urine.  From their web site:

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