On 13/12/2011 2:51 AM, randy oliver wrote:


 >My point: if one is trying to determine the efficacy of any sort of 
treatment or management technique, one MUST include controls!

And do the trial more than once.

I recall a time I was involved with a lengthy vermifuge trial with 
goats.  On one occasion the controls did better than the treated animals.

Geoff Manning

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