Official USDA Swine PIN ear tags
USDA Swine Premises Identification Number (PIN) Ear Tags:
PIN tags shown below are intended for breeding stock that will go to the slaughter house. Beginning January 1, 2015, most major U.S. packers and processors will require a USDA approved, official premises identification number (PIN) swine tag as a condition of sale for breeding stock.
For more information on PIN tags see the following information at Pork.org:
Examples of PIN swine Tags: (click photo for link to buy item)