(Sorry to have opened this can of worms :-).
(Sorry to have opened this can of worms :-).
(http://www.ers.usda.gov/topics/animal-products/cattle-beef/s...)
So about 1 pound of antibiotics for every 800 or 900 pounds of beef. Apparently a beef steer dresses out to about 60% meat, so those 800 to 900 pounds of beef represent 1300 to 1500 pounds of cattle.
So on average each animal is getting a little less than 1 pound of antibiotics each year (edit: Oops, I ignored that the Wired numbers roll up all livestock antibiotics. So there is pork and poultry further diluting that 1 pound).
Remember what the antibiotics are being used for here. It's not just 'oh, we're not sure if the animals are getting sick cause we have so many of them so we'll just give them antibiotics in case', it's 'oh hey, if we give them antibiotics, they gain weight faster'. The level of antibiotic use (along with nearly all business practices in large scale animal farming) is almost directly dictated by consumer demand for cheap meat. There's simply no way around that - and this comes from a lover of meat.
We really need to adjust our expectations of our food supply.
I didn't do any comparing to human uses because most people are familiar with the facts that they don't usually take antibiotics and that when they do, they take a small amount for a couple of weeks.
The human dosing for tetracyclin is ~1 gram per day (http://www.drugs.com/dosage/tetracycline.html), so I would want to look a lot further into the impact of giving that amount to animals before I got too worried about it (I favor careful regulation of animal antibiotic use whether I am worried about it or not). I would also want to see some reliable reporting on the actual administration patterns (i.e., is it literally mixed into the feed or is it simply the case that industrial animal growers have a lot of sick animals to treat?).
Industrial meat != meat
It's like saying that because most restaurants are unhealthy (e.g. fast food) you should zealously avoid all restaurants.
That was until I met my neighbor, who's in his late 70s. He is simply the smartest person I know (a biomedical engineer, with knowledge of nearly everything you can bring up)... it seems as if he's still at the height of his intellect. My perception of things since meeting him has changed -- if you take good care of yourself now, exercise, take your vitamins, etc. you can really genuinely enjoy life when you're older. The guy spends the morning of every other day at the gym for about an hour. He can lift more weight more comfortably than I can -- he's almost 80, I'm in my mid-20s.
Also see William Shatner: http://www.reddit.com/user/williamshatner
The guy is 81 years old and so very astute and smart.
But why lenghten the agony?