In this instance the inference is that livestock are just fed mountains of antibiotics indiscriminately. Are you kidding me? Why would anyone do that? While not as expensive as meds for humans, veterinary medications are not cheap and no operator is going to waste money treating a whole herd unless it is absolutely necessary.
Furthermore, take some time to read up on the FDA website about how livestock production is regulated. It is far from the free for all that is so frequently represented.
If you are interested in a very educated and thorough perspective on how livestock are cared for at a feedyard, check out this blog by a Dartmouth educated operator in Nebraska: http://feedyardfoodie.wordpress.com/
On a semi-related note, can you name the product that was responsible for the last three E. coli outbreaks here in the States?