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Dry period length as related to the percentage of colostrum samples in which antimicrobial residues were found
| Length of dry period | Number of samples | Percentage positive (%) |
|---|---|---|
| Shorter than 44 days | 32 | 72% |
| Between 44 and 62 days | 59 | 64% |
| Longer than 62 days | 27 | 52% |
