01-19-2012, 02:03 AM
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Depends. 45 mins a day doesn't sound like much work, so considering that I wouldn't think she'd need extra energy to do it, but I don't know the horse, the rider, the work.
If she's gaining more unneeded condition, if she's not losing any on just grass/hay, &/or you can't feed her over at least a few small meals daily, I'd lose the grain & other high starch feeds.