Police in Cheshire have appealed for information relating to the theft up to 45 sheep from a field in Northwich, Cheshire on August 14.
The Cheshire Police Rural Crime Team have urged the public to be on the lookout for any suspicious activity around fields or farm buildings and to look out for "unfamiliar" livestock trailers or trucks.
Police are continuing to stop and check vehicles carrying livestock in an attempt to track down missing animals.
Cheshire Police Rural Crime Team said:
"We attended a report of theft of livestock involving (at least) 45 sheep which have been taken from a field near Davenham, Northwich.
The cost of the theft is over £8,000, not counting any of the costs and time involved in nurturing and breeding the lambs.
"The investigation is ongoing, with a number of lines of enquiry being completed along with checking of the surrounding area.
"We will continue to stop vehicles carrying livestock and we would ask the public to report any suspicious activities around your farms or livestock. We are especially keen to identify livestock wagons or trailers that appear unfamiliar.
"Livestock thefts of any sort are cruel, to the farmer that has taken time to raise their livestock, and to the animals which may be handled incorrectly."