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BRIEF: Can flax seeds be poisonous to horses?

Please advise me where I can get competent information on the toxicity of flax seeds if fed to horses. I would like to feed a half cup per day of raw, ground flax seeds (horse is 1500 lbs/warmblood), but I've been warned flax seeds are "poinsonous" unless boiled first? I'm aware flax contains a goitregenic glucoside, but I thought that this is not severely toxic and would have to be fed in extremely large amounts for goitregenicity. Am I mistaken?


Flaxseed also contains cyanide-releasing glycosides in varying amounts. You would want to find out how much is in your particular batch before dosing horses with it.