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RE: [RC] [RC] Blood test levels - heidiI wondered about that too. Found a survey of trace elements in Icelandic forages. Coastal and mountainous areas are adequate at 0.1 to 0.2 ppm, otherwise low. Considering that we are looking for an overall dietary average of 0.9 ppm, calling that "adequate" is a bit odd... Sounds like if the rest is lower, they have indeed been selected in an area that is pretty darn deficient. Had another client with an inactive horse (recovering laminitic), forage selenium tested and virtually undetectable, full size horse this time (Arab cross), put on 3 mg/day Se yeast and serum selenium came back 190 (high for serum) a year later. This is well below anything toxic but surprising. Might have been a post feeding peak, but it's difficult to get serum Se over 160 or so with selenite. Depends on the horse. In practice I saw quite a variance in responses to oral intake in terms of how much it took to get them into a "normal" range (and no, 160 is not "high" even for serum--given what you've said about the differences between serum and whole blood, that's just a good normal, given that normal for whole blood is 200-250). But I've never seen any go above normal (testing whole blood, where we would see it) even supplementing 7.5 mg per day on a long-term basis. 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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