Tissue residues of sulfadimethoxine following dietary administration to broiler-chickens.

Broilers were divided into four groups and the first group served as the control. The second, third and fourth groups were given feed containing 25, 50 and 100 mg/kg of sulfadimethoxine (SDM), respectively, for 21 days, and thereafter each group received the SDM free feed. On certain days during the experiment period, three broilers in each group were sacrificed and tissues, including blood, heart, liver, spleen, gizzard, thigh muscle, breast muscle and fat, were collected and residual SDM were determined by HPLC. Two days after withdrawal, SDM in each tissue had decreased to below the detection limit of 0.01 microgram/g.