Table 1.
Number of cows, average ± standard deviation of anti- O. ostertagi antibody levels in individual milk before treatment registration and distribution of breed, lactation number and year quarter of calving in the treated and untreated group
| Parameter | Eprinomectin | Control |
|---|---|---|
| Number of cows | 234 | 243 |
| Anti- O. ostertagi antibody level (ODR) | 0.49 ± 0.3 | 0.52 ± 0.3 |
| Breed (%): | ||
| Holstein Friesian | 43 | 46 |
| Other | 6 | 5 |
| Lactation number (%): | ||
| First | 14 | 12 |
| Second | 13 | 13 |
| Third or higher | 26 | 22 |
| Year quarter: | ||
| Jan - Mar | 10 | 14 |
| Apr - Jun | 13 | 8 |
| Jul - Sep | 13 | 12 |
| Oct - Dec | 15 | 15 |