The sheep were stolen from farmland near Llanfechain, Powys.
More than 40 pregnant ewes have been stolen from a farm in North Powys.
Dyfed-Powys Police are investigating the theft of 46 pregnant Welsh Mule ewes from enclosed farm ground in the Llanfechain area.
Farmers and the public have been asked to remain vigilant, check and secure the gates to land containing livestock and report any suspicious activity to the police immediately
Anyone with any relevant information that can help this investigation, are urged to contact the police by telephoning 101 or alternatively Crimestoppers anonymously on 0800555111.
Any information provided will be treated as confidential.
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