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Re: [RC] selenium - Heidi SmithI had a grass hay analysis done. The selenium is 13.5ppm. When I do the math, it seems really high. Or maybe I'm not doing it right? Is this something (else!)to worry about? Thanks for your help!Ppm is the same as mg per kg, so yeah, my math comes out as an average horse eating twenty pound is getting a whole lot of selenium, even for endurance horses. There is some literature demonstrating that 8.5 ppm forage fed long term can cause chronic toxicity (though it would take levels about 40 times that high to cause acute toxicity). That would be right in line with the OSU work that says that 60-90 mg per day can cause chronic toxicity. I would get another sample run, point out the high selenium to whoever did your sample and ask if it could be a mistake and if not, get serum Se levels checked for your horses. Any chance at all that there was a typo and the 13.5 is actually 1.35 ppm? Or even .135 ppm? In Nevada, it is entirely possible that you could have a batch of hay that is actually 13.5 ppm, but I'd also pursue getting another sample run. There are a few small toxic areas in Nevada, while the rest of the state tends to be deficient. Ideal concentration would be somewhere in the range of .8 to 1.0 ppm, so if it was 1.35, it would be just fine. If the hay came from Oregon, I'd wonder if they really meant 13.5 ppb (parts per billion)--which translates to .0135 ppm--we could pretty much plug in "zero" for the selenium in the hay there and feel pretty confident that we were in the ballpark... <sigh> Heidi =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ridecamp is a service of Endurance Net, http://www.endurance.net. Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp Ride Long and Ride Safe!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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