EN
The study investigated the presence of sulphadimidine residues in eggs after per oral administration of Sulfadimidin PG plv. sol. ad us. vet. (120 mg/hen/day) to laying hens. Premi®Test, a four-plate microbiological method, and HPLC were used to detect sulphadimidine residues. The positive findings of the Four-plate test (FPT) were confirmed by the results of Premi®Test. The absence of sulphadimidine residues was confirmed 72 hours after the last sulphadimidine administration by using the FPT. The presence of sulphadimidine residues was detected by Premi®Test within 8 days and by the FPT within 3 days after the last administration. The FPT test reported false-negative results for five days (kappa < 0.6) as compared with the results of Premi®Test. The study confirmed the conformity of results obtained by both Premi®Test and HPLC (kappa = 0.6).