 |
RE: [RC] [RC] [RC] Blood test levels - heidiThere are very few places in the world where forages are ever going to average that high. What is adequate or ideal for endurance is likely very different from other classes of horses. Adequate boils down to what is required to keep blood levels within a normal range and prevent deficiency, including less obvious effects like suboptimal fertility and immune function. That may be true, but the recommendation for 8-10 mg per day in the diet came out of Oregon State University and was not aimed at endurance horses--it was aimed at the everyday population. Are you talking about sodium selenite or Se yeast? Endurance horses or other classes? Even 7.5, for sodium selenite at least, is way below the suggested intake for chronic toxicity of 20 ppm, more than likely because the kidney can easily handle any overloads up to that level. However, all the research was done with sodium selenite and Se yeast appears to accumulate to a greater level than sodium selenite. Not sodium selenite specifically, but inorganic selenium sources in general, of which sodium selenite is likely the most common. The OSU numbers came out before selenium yeast was on the horizon. And they suggested chronic toxicity levels of 60-90 mg (which for an average horse eating in the ballpark of 10 kg per day, is of course around 60-90 ppm). The selenium yeast may well accumulate selenium much more efficiently than sodium selenite--not arguing that point. My main point is that most horses have inadequate intake, period, and that toxicity does not loom as closely as many would have you believe. 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!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
|