Fw: Selinium requirements

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

You got me Jim. The UCD recomendation in the table should read 3, not 0.3. I
am embarrased  - as an old engineer that did his work with a slide rule and
had to keep track of the decimal point in his head, I should be able to do
better - guess a few too many of them up there have damaged a few cells.

It is hard to know whether Hart was including any safety factor in the low
level toxicity, so I don't know quite where to put that number - make your
own decision.

Duncan Fletcher
dfletche@gte.net

-----Original Message-----
From: Jim Mitchell <navion@lightspeed.net>
To: Duncan Fletcher <dfletche@gte.net>
Date: Wednesday, January 21, 1998 1:48 PM
Subject: Re: Selinium requirements


>Duncan Fletcher wrote:
>>
>> Interesting.
>>
>> For your 900lb (aprox 400kg) horse eating 20 lb (approx. 9kg). The
numbers
>> as follows:
>>
>>             Recom        Max      Toxic        LD50
>>
>> Heide     8-10         n/a           60-90      n/a
>> Duncan  na             18            n/a          n/a
>> Susan     na             18             *          1320*
>> NRC      0.9           18             na         1320
>> Hart       1              na              2            na
>> Giffen    0.9           na             80           n/a
>> UCD     0.3            na             na           n/a
>>
>> na - no number given in post.
>> * Susan posted this (3.3 mg/kg body weight) as toxic in her post, but it
is
>> the LD50 number from NRC.
>>Hi Duncan,
>  Thanks for the summary.  A couple possible changes.  The UCD book states
.3ppm of Se
>in their feed. This works out to 2.5mg/day I think, not .3 as you have in
the table.
>Also Courtney Harts book states 2mg/day as possible low level chronically
toxic. This
>probably fits better in the max. column.  Thanks and let me know if you
think my math is
>wrong on the UCD formula.
>  Also I was glad to see a better explanation of Susan's high amount and
the NRC max
>amount not the recommended amount.
>
>Jim Mitchell
>>