EN
After the intramuscular administration of Engemycin L.A. inj. ad us. vet. (0.8 ml. 10kg⁻¹) to seven ewes for four consecutive days, the milk samples were collected at every 12 h of the experiment, from 0 to 166 h. The milk samples were analysed by the high performance liquid chromatography (HPLC) method. Twelve hours after the beginning of the experiment, all milk samples were positive for the presence of oxytetracycline (OTC) residues. The maximum mean concentrations were reached 12 h after the final administration (3.67 μg.g⁻¹). The OTC residues were not detected in any milk sample 84 h after the final administration.