Troubleshooting Antibiotic Residues in Goat Milk

 Causes Solutions
 A) Milk from treated does enters bulk tank before end of withdrawal time
  • Poor communication between person who treated and person who milks
  • Post treatment information on a message or bulletin board to ensure people milking are aware of the identification of treated does and the appropriate withdrawal time.
  • No permanent records of treatments
  • Make a permanent record of all treatments.
  • Forgetting doe was treated
  • Poor identification of treated doe
  • Mark all treated goats in an easily recognised manner (such as spray marker or coloured tape) and segregate.
  • Treated dry does not separated from milking does
  • Use appropriate antibiotic tests.
  • Separate dry does from milking does.
  • Separate milker unit not used for treated does
  • Milk treated does last or with separate equipment to ensure no contaminated milk can enter the milk supply.
  • Milker unit not cleaned properly between treated and untreated does
  • Thoroughly clean milker unit and all other potentially contaminated milk contact surfaces between milking treated and untreated does.
  • Milkline used as a vacuum source to milk treated doe when using bucket milker to withhold milk
  • Have equipment dealer install separate inlet into vacuum line.
  • Not keeping out all milk from both halves of the udder out of the bulk tank
  • Discard all milk from treated does.
B) Prolonged drug withdrawal time because antibiotics used in extra label fashion
  • Using antibiotic drugs not approved for use in lactating does
  • Only use antibiotics according to veterinarian's prescription.
  • Livestock medicines administered by a route different from label recommendations
  • Use only approved livestock medicines, and only according to label instructions or according to a veterinarian's prescription.
  • Antibiotic drugs used at a higher dosage and/or more frequently than label instructions
  • Only use antibiotics according to label or veterinarian's prescription.
  • Feeding medicated feeds
  • Medicated feeds for non-lactating goats should be stored separate from the milking herd feeds.
  • Remove all traces of medicated feed from storage and feed handling equipment.
  • Inadequate udder preparation of does treated with antibiotic ointments and salves
  • Use appropriate antibiotic tests before putting new does into milking line-up.
  • Early kidding of does that have been dry treated
  • Confirm date of dry-off treatment of freshened does to ensure whether or not adequate withdrawal time has been observed.
  • Consult with your herd veterinarian.
  • Use appropriate antibiotic tests.
  • Purchasing does that have been treated
  • Use only approved products.
  • Follow a recommended practice of udder preparation.

For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 01 May 2001
Last Reviewed: 12 February 2014