Table 3.
Average concentration (µg kg−1) of oxytetracycline plus 4-epi-oxytetracycline, enrofloxacin plus ciprofloxacin, tylosin, florfenicol and sulfachloropyridazine at different d post-treatment in droppings of treated broiler chickens.
| Sampling point | Post-treatment day | Day of life of the birds | Average concentration (µg kg−1) |
||||
|---|---|---|---|---|---|---|---|
| OTC + 4-epi-OTC1 | EFX + CFX2 | TYL3 | FF4 | SCP5 | |||
| 1 | 5 | 25 | 872.04 | 113.54 | 104.66 | 134.70 | 516.61 |
| 2 | 10 | 30 | 754.15 | 68.23 | 66.50 | 274.07 | 141.56 |
| 3 | 14 | 34 | 2058.97 | 283.78 | 37.70 | 126.43 | 171.17 |
| 4 | 18 | 38 | 1481.77 | 75.69 | 71.84 | 156.55 | 319.84 |
| 5 | 22 | 42 | 1471.41 | <LOQ6 | ND7 | <LOD8 | 20.99 |
| 6 | 30 | 46 | - | - | - | - | 34.04 |
| 7 | 34 | 50 | - | - | - | - | <LOD9 |
1
Oxytetracycline plus 4-epi-oxytetracycline.
2
Enrofloxacin plus ciprofloxacin.
3
Tylosin.
4
Florfenicol.
5
Sulfachloropyridazine.
6
Enrofloxacin: 32 µg kg−1, only one sample quantified above the Limit of quantification of 38.02 µg kg−1 for enrofloxacin and 20.98 µg kg−1 for ciprofloxacin).
7
Non detected.
8
Limit of detection in matrix for florfenicol: 11.2 µg kg−1.
9
Limit of detection in matrix for sulfachloropyridazine: 7.4 µg kg−1.