Reference | Gebreyes2006 (10194)

20 groups of pigs reared in conventional (10 herds) andantimicrobial-free (ABF; 10 herds) production systems in North Carolina sampled between October 2002 and October 2004. Allthe conventional farms were located in two counties in the south-eastern part of the state. The ABF farms were located in the north-eastern (n55) and southeastern (n55) parts of the state. Under the conventional system ofpig production, antimicrobials were added to the feed for growthpromotion and were also used for therapeutic purpose. No anti-microbials were used for any purpose in the ABF production post-weaning. Sick pigs that were given antimicrobials for treatmentin the ABF units were immediately removed from the herd, keptin a different barn or pen, and marketed as conventional. Theywere excluded from this study. Overall, a total of 889 individualpig fecal samples (475 from conventional and 414 from ABF) and743 carcass swabs (381 from conventional and 362 from ABF)were sampled at farm and slaughter, respectively.

Fecal samples and carcass swabs werecollected at farm and slaughter. Approximately 10 g of fresh fecal matter was collected from each pig per rectumwith sterile gloves. At the slaughter plant, we sampled carcasseswith swabs soaked in 10 ml of buffered peptone water (BPW;Becton Dickinson, Franklin Lakes, N.J.).

AST Method: None

Reference explicitly reports AST breakpoints: False

Reference reports using a MIC table: False