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The sixteenth deliverable of the project is one of the deliverables from
work package 5 "Prevention of antibiotic residues" and covers
'Influences of milking
intervals and frequencies in automatic milking systems on excretion
characteristics of different antibiotics in milk'.
The prevention of antibiotic residues is an important aspect of milk quality.
Limited information is available on the influence of milking frequencies
deviating from regular milking of 2 times per day on the excretion of
antibiotic residues in melk of treated cows. This deliverable reports the
results of research on the excretion of antibiotic residues in milk of healthy
cows. For three drugs tested the milking frequency had a signifant effect on
the excreation period: with increasing milking frequency the excretion period
decreased. For one drug the excretion period was not influenced by the milking
frequency. It is concluded that commercially available microbial inhibitor
tests applied as screening methods for detection of antibiotic residues in milk
detected penicillin G, ampicillin and nafcillin at concentrations below or at
Maximum Residue Levels (MRL), whereas sensitivity for detection of cefquinome,
dihydrostreptomycin and colistin was insufficient. Message date:
November 17, 2003
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