http://www.aphis.usda.gov/newsroom/content/2009/01/naistrace.shtml
USA - USDA proposes to amend livestock regulations to enhance animal disease traceability
The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) is proposing to amend its domestic livestock regulations in order to enhance the traceability of animals in the United States. These proposed changes would create greater standardization and uniformity of official numbering systems and eartags used in both animal disease programs and the National Animal Identification System (NAIS).
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