Almost 30 sheep have been seized as part of a special operation in the Ramelton area.
Following a joint operation by Gardai in Milford and the Department of Agriculture Special Investigation Unit, 13 ewes and 15 lambs were seized yesterday.
Investigations are ongoing to ascertain the ownership and traceability of the livestock.
Gardaí are appealing to farmers if they have information on irregularities or traceability in livestock to contact them.