Reference | Chander_2008_JoofthScofFoanAg (10263)

Manure and soil samples were collected from seven turkey farms in Minnesota which were using antibiotics as feed additives (AU farms). Similar samples were collected from six other farms where no antibiotics had been used as feed additive for the last three or more years (NAU farms). The NAU farms generally raised their flocks in an open area on the farm whereas AU farms housed their birds in enclosed barns. At the time of sample collection, turkey producers were surveyed for the types of antibiotics being used subtherapeutically on their farm as well as for their manure management practices. The most common sub-therapeutic antibiotics used were oxytetracycline, monensin and virginiamycin and the antibiotic dose ranged from 20 gT−1 to 60 gT−1 of feed. None of the NAU farms were using antibiotics at the time of sample collection. All the NAU farms selected in this study were those practicing ‘noantibiotic’ policy for the last 3–5 years.

Manure samples from the AU farms were collected from inside the turkey barns whereas manure samples from NAU farms were collected from areas where the birds were fenced in.

AST Method: Broth Microdilution

Reference explicitly reports AST breakpoints: True

Reference reports using a MIC table: False