I was wondering if alfalfa stems, stripped of the leaves, are also bad for IR horses?
We don't know enough about the issue with alfalfa and some horses to really answer that for sure but members in the past have fed stems or old/stemmy alfalfa with no problem.
I would suggest don't obsess about these left over stems but keep a close eye on your horse for any indication they are causing a problem.
Eleanor in PA www.drkellon.com EC Co-owner Feb 2001