Disease tests held at farm.
Foot lesions were detected yesterday morning at the County Antrim facility and samples were sent for testing at the Institute for Animal Health.
Movement restrictions were imposed by Chief Veterinary Officer Bert Houston at the abattoir and the premises of origin.
Officials believe the symptoms could be linked to Swine Vesicular Disease or foot-and-mouth which originated at a Northumberland farm and paralysed food production and tourism events across the UK in 2001.
The outbreak led to the slaughter of 6.5 million animals and is estimated to have cost the UK up to pounds 8bn.