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The detection of antimicrobial residues in ex-farm, bulk, raw, cows' milk by the Delvo X-Press β-lactam test and by the Delvotest P was compared. Of 500 samples, 499 gave the same results by the two procedures. One sample classified as Delvotest P-negative gave a borderline positive result with the Delvo X-Press test but a negative result upon re-test. Fifty samples giving positive results by the...
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