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RE: [RC] Selenium per Susan Garlinghouse - heidiIn other words, Susan is even upping some of the recommendations that came out of Oregon State several years ago--and I'd second her recommendation.
To put this in perspective, most "high selenium" supplements are designed to deliver only 2 mg per day to the horse--so per our old recommendations, one would have to feed them at 4-5x the "recommended" level, or at Susan's recommendation, at about 8x the "recommended" level, if one's forage is nearly devoid in selenium, as is the case both in Oregon where my levels originated, or in SoCal, where Susan practices. But to have a toxic dose, the horse would have to consume 600 days' worth of the "recommended" level. (In other words, don't panic if your horse gets into the tack room and eats a bunch of it.) Chronic toxicity actually occurs at about 60-90 mg per day--but that kind of level has to go on for a couple of months or so to build up to toxic levels. (And that would mean feeding most "high selenium" supplements at 30-45x the daily "recommended" dose every day for that time period.)
Additionally, one would have to live in an area where there are practically toxic levels in the forage (rare indeed!) in order to get any sort of toxicity from any normal levels of supplementation.
Does that help to put it into perspective? :-)
Heidi
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