Re: Nitty gritty on selenium!

["Duncan Fletcher" <dfletche@gte.net>]

Assuming a 1000 lb horse eats 2% of its weight, the NRC numbers would 0.9 mg
as an adequate number. The toxic number would be 90 mg. They are thus in
rough agreement as to toxic level, but differ as to adequate level. It would
be interesting to know why the difference.

Duncan Fletcher
dfletche@gte.net


-----Original Message-----
From: CMKSAGEHIL@aol.com <CMKSAGEHIL@aol.com>


>In a message dated 1/18/99 4:15:16 AM Pacific Standard Time,
dfletche@gte.net
>writes:
>
><< I kindof expected someone else to answer this. From NRC, adequate
> concentration: 0.1 mg/kg of overall diet, maximum tolerable dose 10 mg/kg
of
> overall diet. Concentration in supplements may be measured a number of
> different ways: parts per million, mg/lb, microgram/lb. Blood tests can
run
> to discover the true selenium status of the horse.
>  >>
>
>I have always used Oregon State's recommendations--daily requirement for
>1000-lb horse of 8-10 mg per day, with chronic toxic levels of 60-90 mgs
per
>day.  Actually, that probably comes out to be somewhat similar to the NRC
>values, but for those of us in deficient areas where we can figure our
diets
>at practically zero, it is easier to calculate the number of milligrams
that
>we are feeding via supplement than it is to relate it back to total intake.
>Also, the blimp on a diet still needs his selenium, and even though the
>requirement may be more for a working horse, it likely doesn't double, even
>though his overall feed intake may well double, in my experience.
>
>Heidi
>