Minnesota Public Radio slideshow:
Tracking livestock to prevent disease
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As part of the National Animal Identification System, these cows would each receive a radio frequency ear tag containing a unique 15-digit identification number. (MPR Photo/Lorna Benson)

As part of the National Animal Identification System, these cows would each receive a radio frequency ear tag containing a unique 15-digit identification number.

(MPR Photo/Lorna Benson)
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