selenium info

["R. M. Raymond" <keishastar@juno.com>]

dfletche@gte.net writes:
From NRC, adequate concentration: 0.1 mg/kg of overall diet, maximum
tolerable dose 10 mg/kg of overall diet.

CMKSAGEHIL@aol.com  writes:
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.

can be measured a number of different ways: parts per million, mg/lb,
microgram/lb.

Does anyone know how to convert mgs to parts per million?  I was reading
a mineral supplement bag today, and it has 36ppm.  It didn't say per
ounce or per pound or even serving.  It did say to feed free choice, or 2
oz/day. 

[Rose]
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