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RE: [RC] [RC] [RC] Blood test levels - heidi

There 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

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