Police have urged property owners to be vigilant after the theft of 260 merino ewes in Bigga.
Rural crime investigator Senior Constable Dale Croker said the sheep were stolen from a property on Greenmantle road over a 12-month period. He said they were taken in smaller lots of 40.
"[The thief] is someone who knows the property."
He encouraged residents to be vigilant and "keep an eye out for anything suspicious".
The police officer said property owners should pay particular attention to trailers covered with tarps that could be used to transport stock.
Senior Constable Croker advised that Property Identification Code (PIC) tags could be cut out and replaced by thieves, while ear marks were "harder to offload".
He said the stolen ewes had a "very distinctive ear mark".
Some of the sheep also have two holes in their left ear from ear tag removal.
Anyone with information about the theft or current location of these sheep are urged to call Crime Stoppers on 1800 333 000. Alternatively, contact Goulburn police or the Hume Police District Rural Crime Investigators on 4824 0799.
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