Police in Kaipara are investigating the slaughter and theft of two cows - one where the legs were hacked off a pregnant cow and its body left in a paddock.
While it is unclear if the two incidents were linked, both are believed to have happened last Wednesday night.
At a Waiotira farm, 32km south west of Whangarei, just a piles of internal organs remained.
One of the farm's owners said the two-year-old Angus heifer was taken from a paddock close to the road.
She said it happened around midnight when the cattle were sleeping by the fence. She thought the heifer, which was in a paddock with about 25 to 30 other animals, had probably been shot.