Hamilton police are investigating after 1100 merino sheep worth more than $250,000 were stolen from four properties across five weeks.
They are being joined by officers from the Ararat and Bacchus Marsh police service areas in investigating the large-scale thefts including:
Police believe a truck or multiple trips with a small trailer may have been used.
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Farm crime coordination unit inspector Paul Hargreaves urged residents to report all incidents.
"There is a huge economic loss from sheep theft of this nature, but despite this many incidents are not being reported to police, which hinders our ability to prevent, disrupt or respond to incidents of livestock theft," he said.
"While we acknowledge the work of local farmers in protecting their livestock, the farming community including farmers, neighbours, stock agents and transporters can always do better by keeping an eye out for suspicious activity and reporting anything out of the ordinary to police.
"It is vital that if you see something, hear something, know something or suspect something, that you report it immediately - the information you have might be the last piece of the puzzle that could then solve the crime."
Anyone with information should contact Crime Stoppers on 1800 333 000.
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