Markings usually remain visible for the duration of the milk withholding period, but not for the full length of the meat withholding period. You must use permanent identification systems and written records to check when meat withholding periods have expired.

Guideline 20 and Technote 20 provide practical and technical information on:

• Keeping records of all treatments and checking these for every cow before she is sold
• Not selling meat unless the antibiotic withholding period for meat has passed