http://en.wikipedia.org/wiki/Selenium
I have read of accidental livestock poisonings by selenium, when an error was made in adding it to the feed. Because it is used in such small amounts, errors can occur at this step.
Just because the labels read correctly doesn't mean the feed was compounded according to the label.
I have seen errors in compounding TPN fluids for humans that were made the same way.
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.