Originally Posted by verona1016
FWIW, I feed whole flaxseed to my horse and don't see whole seeds in his manure at all.
^^I heard this, that feeding whole flax was OK after all, but asked my nutritionist & she begged to differ. But the above bit I quoted has got to say something about that!
I think it's an important point that you mentioned Verona that if a horse can be allergic to grass, well.... So perhaps the idea came from a rare horse that had a problem with it, from horses that developed probs due to eating rancid or mouldy meal - as Smokum described, they deteriorate very quickly when processed. Or perhaps it was just a coincidence that a horse became lame after being fed flax, so that got the blame.