About 200 in-lamb merino ewes, worth as much as $40,000 in total, have been stolen from Ribbonwood Station at Omarama in Otago.
Police said yesterday the theft was reported about a week ago, but occurred some time between the end of August and September 26.
The ewes were taken from a remote part of the 7289ha property.
Constable Nayland Smith, of Omarama said there were two points of access - through the farm, which would have gone past the homestead, or from Lake Ohau Rd, across Department of Conservation land.
It would have been very difficult to get a truck into the area and he suspected a 4WD vehicle may have been used, making a number of trips.