[xoxoxoBruce]

Originally Posted by jinx

*Steers were initially fed a barley silage-based diet, followed by transition to a barley grain-based diet.

*Despite not being administered antibiotics prior to arrival at the feedlot, the prevalences of steers shedding TET- and ampicillin (AMP)-resistant E. coli were >40 and <30%, respectively.

But chose to ignore...

Antibiotics were selected based on the commonality of use in the industry and included chlortetracycline plus sulfamethazine (TET-SUL), chlortetracycline (TET), virginiamycin, monensin, tylosin, or no antibiotic supplementation

Like I said, they fed them low level drugs.

*Irrespective of treatment, the prevalence of steers shedding TET-resistant E. coli was higher in animals fed grain-based compared to silage-based diets.

So what, it's the wholesale feeding of drugs that causes drug resistant bugs to develop.

*All steers shed TET-resistant E. coli at least once during the experiment. ("All" includes control group ie. no antibiotics)

That's no surprise, ever see cows eat? half of what they eat has been dropped by one or more other animals.

*The findings of the present study indicated that subtherapeutic administration of tetracycline in combination with sulfamethazine increased the prevalence of tetracycline- and AMP-resistant E. coli in cattle.

That's what I said.

However, resistance to antibiotics may be related to additional environmental factors such as diet.

And hell may freeze over. How the fuck can they tell, when they fed all the cattle the same diet. When they were fed the barley-grain they shed more? Well, they had been eating low level drugs for a longer time...duh.