Randy:
How about if I ask - "Is there any way to tell which ones are NOT useful to you?"
The e only exception here is we can tell by negative reactions of our animals what is only an over dose - or possibly a lack of something.
But untill ALL is known about what and how much each animal requires - in it's total requirement for optimum health....
AND until we have the ability to test for such..................
Looks like regardless of our degrees/experience - we are ALL still very much amateurs doing the best we can.
Again - please, let's not turn this into a trace elment thread - until we have dealt with the comparisons with Balling vs 2 part.
T