The Cellar - View Single Post

jinx · 06-11-2010, 10:05 AM

*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.

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

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

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

06-11-2010, 10:05 AM	#98
jinx Come on, cat. Join Date: Nov 2003 Location: general vicinity of Philadelphia area Posts: 7,013	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*. Irrespective of treatment, the prevalence of steers shedding TET-resistant E. coli was higher in animals fed grain-based compared to silage-based diets. All steers shed TET-resistant E. coli* at least once during the experiment. ("All" includes control group ie. no antibiotics) 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. However, resistance to antibiotics may be related to additional environmental factors such as diet. __________________ Crying won't help you, praying won't do you no good.