title: Elimination of sulfamethazine residues from swine.
abstract: Tissue concentrations of sulfamethazine in swine fed the drug at the rate of 500 g/ton of ration (550 g/1,000 kg) for a 30-day period depleted to 0.1 ppm or less within 4 to 10 days after withdrawal of medicated feed. Depletion from the tissues and plasma of treated pigs showed a linear relationship with time when the concentrations were plotted on a semilogarithmic graph. Six untreated pigs that were placed on bedding in pens formerly occupied by the treated group developed tissue residues at or above 0.1 ppm sulfamethazine; the mean plasma concentration of sulfamethazine reached 2.8 ppm by day 15.
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000818:Animals; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D009132:Muscles / Q000378:metabolism; D013418:Sulfamethazine / Q000097:blood / Q000378:metabolism*; D013552:Swine / Q000378:metabolism*
chemical_list: D013418:Sulfamethazine