Under the testing and tracing back system, pigs are tattooed with consignment-specific, five-digit numerals identifying the farm of origin and are tested for clenbuterol on admission to slaughterhouses.

• 根据测试及追查系统，猪只身上均刺上该批猪只专用的五位编码，以识别生产猪场。猪只在送入屠房时，必须接受氨哮素测试。