Levels of Oxytetracycline Residues in Cow’s Milk Collected in Tetovo, Macedonia From 2013-2014
Abstract
The evaluation of oxatetracycline residues in cow’s milk in cattle farms in Tetovo, Macedonia was carried out from 2013 to 2014. The control covered 25 milking cows’ farms analyzing cow’s milk samples for level of oxyteteracycline. This study was completed performing analytical control for detection of oxatetracycline residue in 135 fresh milk samples using qualitative ELISA test. The positive samples confirmed by ELISA were kept in refrigerated condition and later are analyzed by high performance liquid chromatography (HPLC). The laboratory detection by HPLC made quantitative evaluation of oxyteteracycline residues in milk samples. Analytical control carried out by ELISA test confirmed presence of oxyteteracycline residues in 4.4% (6/135) of raw milk samples. Further analytical check with HPLC evaluated all positive milk samples confirming different values of oxyteteracycline per liter milk: 60ug/l, 90ug/l, 220ug/l, 260ug/l, 430ug/l, 1340ug/l (ppb). The found values of oxatetracycline residues in cow’s milk samples are shown the possible risk for public health in Tetovo region.
Keywords: milk, cows, residues, oxyteteracycline, Tetovo.
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