Table-2.
Number of samples detected positive for tetracycline and penicillin in different milk samples.
| Dairy product | Tetracycline | Penicillin | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Positivea/n | % positive | Minimum/maximum of the positive sample (μg/kg) | Median (μg/kg) | Interquartile range | Mean±SD (μg/kg) | Positivea/n | % positive | Minimum/maximum of the positive sample (μg/kg) | Median (μg/kg) | Interquartile range | Mean±SD (μg/kg) | |
| Raw milk | 4/4 | 100.0 | 0.66/1.71 | 0.80 | 0.83 | 0.99±0.49 | 3/4 | 75.0 | 0.31/0.68 | 0.38 | 0.45 | 0.48±0.19 |
| Pasteurized milk | 9/9 | 100.0 | 0.58/1.75 | 1.04 | 0.85 | 1.06±0.45 | 8/9 | 88.9 | 0.38/0.92 | 0.65 | 0.34 | 0.64±0.18 |
| UHT milk | 6/9 | 66.7 | 0.58/3.33 | 0.62 | 1.46 | 1.43±1.07 | 9/9 | 100.0 | 0.35/0.60 | 0.46 | 0.16 | 0.47±0.09 |
| Full fat milk | 9/10 | 90.0 | 0.58/3.33 | 0.99 | 1.65 | 1.29±0.88 | 9/22 | 40.9 | 0.31/0.80 | 0.45 | 0.27 | 0.46±0.23 |
| Half skimmed milk | 5/6 | 83.3 | 0.58/1.76 | 0.93 | 1.18 | 1.17±0.55 | 6/22 | 27.3 | 0.41/0.92 | 0.60 | 0.28 | 0.74±0.15 |
| Skimmed milk (0% fat) | 5/6 | 83.3 | 0.58/1.74 | 0.64 | 0.72 | 0.93±0.49 | 5/22 | 22.7 | 0.41/0.73 | 0.50 | 0.30 | 0.46±0.31 |
a
Positive samples: Samples in which the antibiotic residue levels exceeded the LOD. LOD tetracycline: 0.50 mg/kg for milk and 1.25 mg/kg for yogurt and labneh products. LOD for penicillin: 0.25 mg/kg for milk and 1.25 mg/kg for yogurt and labneh products. LOD=Limit of detection