Wearing or marked with an eartag; describing livestock or animals that have been identified with an ear marker.
From 'eartag' plus the past participle '-ed' to show the state of being marked. This agricultural term became common in the 20th century as industrial farming required animal tracking.
When governments mandate eartags for disease control, it creates fascinating borders—farms in one valley are eartagged, but just over the mountain, farmers using old methods have unmarked herds, creating a living contrast in technology adoption.
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