Milk Residues

Question 1

what is the purpose of residue surveillance

Answer 1

To assess compliance
To prevent human health issues
To take corrective actions when violations occur

Question 2

Reasons for residues in milk

Answer 2

Didn’t follow full withdrawal time
Use of unauthorised product
Higher doses/longer courses of product given than authorised

Question 3

MRL

Answer 3

Maximum residue limit
Maximum conc. legally permitted in food
Measured in ug/kg

Question 4

Acceptable daily intake

Answer 4

Maximum amount of drug that can be ingested daily over a lifetime without risk to consumer

Question 5

Withdrawal period

Answer 5

Amount of time after treatment required so there are no residues above MRL

Question 6

Issues with antibiotic residues

Answer 6

Risk to human health - allergies, resistance
Used in manufacturing for yoghurt and cheeses

Question 7

Common reasons for bulk tank failure

Answer 7

Withdrawal period not observed
Mechanical failure/leaking valves
Accidental milk transfer
Contamination of recorder jars

Question 8

Common reasons for bulk tank failure (Dry cows)

Answer 8

Calving early/short dry period
Prolonged excretion of antibiotic
Not following withdrawal time
Accidentally milking dry cows
Natural antibacterial substances in astatic milk can cause false +ves

Question 9

Theoretic cow antibiotic concentration =

Answer 9

Conc in bulk tank X (Vol in bulktank/cow yield)

Question 10

Minimum withdrawal times for cascade drugs

Answer 10

Eggs and milk - 7 days
Meat - 28 days
Fish - 500 degree days (50 x 10 degree days)