The Political Economy of Dead Meat 

Like any junkie, cows hooked on BGH tend to get sick, mostly with mastitis, an infection of the udder. Treatment of mastitis requires liberal doses of antibiotics. The antibiotic injected into the cow passes on to the human consumer, and thus contributes to the process whereby more and more bacteria are building up greater resistance to antibiotics.

Source: The Political Economy of Dead Meat – CounterPunch.org