Charlie's comment raises a
 question--the efficacy of any antibiotic or
 pesticide, if applied regularly, tends
 to be lost as the pathogen or pest
 evolves resistance.  Have you seen
 any studies that tracked the amount of
 benefit to feeding livestock species an
 antibiotic over the course of many
 years?  



Not sure that thought has merit? Livestock of rhis variety is not kept that long.  Its moved to market. Or like bees would be succesivegeneratuons. The exceptio. Wouldbe breeding stock. But breedi g stick is generally never put o a high caliber food ?  To much weight gain in them is not good so the are kept lean and fed lesser foods unles the show symptoms
 

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