Table 10.
Summary of NBPT residue in milk
| Average NBPT concentration in milk (ppm)a | ||||
|---|---|---|---|---|
| Phase of study | Day within phase | Treatmentb | ||
| 1× | 3× | 10× | ||
| Dosing | 0 | NA | NA | BQLc |
| 1 | NA | NA | BQL | |
| 2 | NA | NA | BQL | |
| 3 | NA | NA | BQL | |
| 4 | NA | NA | BQL | |
| 5 | NA | NA | BQL | |
| 6 | NA | NA | BQL | |
| 7 | NA | NA | BQL | |
| 8 | NA | NA | BQL | |
| 9 | NA | NA | BQL | |
| 10 | NA | NA | BQL | |
| 11 | NA | NA | BQL | |
| 12 | NA | NA | BQL | |
| 13 | NA | NA | BQL | |
| 14 | NA | NA | BQL | |
| 17 | NA | NA | BQL | |
| 21 | NA | NA | BQL | |
| 24 | NA | NA | BQL | |
| 25 | NA | NA | BQL | |
| 26 | NA | NA | BQL | |
| 27 | NA | NA | BQL | |
| 28 | BQL | BQL | 0.009 | |
| Depuration | 3 | NA | NA | BQL |
| 7 | NA | NA | BQL | |
| 14 | NA | NA | BQL | |
NA, not analyzed.
aMean of data from three cows from the 1× and 3× groups and mean of data from six cows from the 10× group during the dosing phase (days 0–28). In the depuration phase, mean of data from three cows from day 3, two cows from day 7, and one cow from day 14.
bTreatments correspond to target NBPT doses as follows: 1× = 1 mg NBPT per kg BW; 3× = 3 mg NBPT per kg BW; 10× = 10 mg NBPT per kg BW. Target dose values calculated based on the average BW of the dose group from the previously completed week.
cBQL = Below lower limit of quantitation (0.05 ppm). BQL values from individual samples were set to 0 for calculation of mean values