The former abattoir opened as a shopping centre two years ago during the recession.
The abattoir's owner said no horse with false paperwork had ever knowingly been slaughtered there.
The abattoir was closed last week after a visit from an FSA veterinary manager.
Those who survive are often still conscious when their throats are slit by abattoir workers.
BBC: NEWS | UK | England | London | Manure dumped at Ramsay's eatery
The Gaerwen abattoir is one of the largest in Britain, mainly supplying supermarket chains.
Twelve months ago the first case of foot-and-mouth in Wales was confirmed at an abattoir on Gaerwen on Anglesey.
The raids uncovered the first suspected instance of a UK abattoir passing off horsemeat for beef, Mr Paterson said.
But the birds were slaughtered, it seems, at an abattoir where poultry from the affected zone were also killed.
Unfortunately, the gristle and the guts the ugly secrets of the Brown abattoir have been gruesomely displayed for all to see.
Tesco supermarket has extended its ban on Isle of Man meat sales after the abattoir failed a second inspection.
The locations are lush, the reworked ending could not be neater, and the special effects were apparently devised by an abattoir.
In the 1940s a group of farmers and speculators set up a cooperative, building an abattoir that produced both meat and leather.
The Hillside Animal Sanctuary, which took the footage, said it was taken at High Peak Meat Exports abattoir near Nantwich in Cheshire.
BBC: Nantwich horse abattoir investigation after secret film
An investigation has been launched into an abattoir by the Food Standards Agency (FSA) after undercover filming allegedly showed horses being abused.
BBC: Nantwich horse abattoir investigation after secret film
No date has yet been finalised but abattoir bosses are now waiting to hear which Manx meat the supermarket will be selling.
The Polish abattoir linked to beef found in Newry that contained horsemeat, has said it does not process equine products in its factories.
The agency is working with French authorities to try to trace the six carcasses, which were slaughtered at an abattoir in Somerset, England.
The supermarket giant, one of the abattoir's biggest clients, removed all Manx meat produce from its shelves last February after a routine inspection.
The supermarket giant removed Manx meat from its shelves last February after a routine inspection of the Manx abattoir raised concerns over standards.
The Kravys abattoir, in Botosani, northeastern Romania, slaughters 3, 000 to 4, 000 horses annually and exports the meat to Sweden, the Netherlands, Bulgaria and Poland.
FORBES: The Romanian Horse Cart Ban That's (Probably) Behind Europe's Horse Meat Scandal
In a report by the BBC, the abattoir insists that its labeling and procedures are above board, with horsemeat and beef kept clearly apart.
FORBES: The Romanian Horse Cart Ban That's (Probably) Behind Europe's Horse Meat Scandal
The Kravys abattoir, named as the source of the Comigel meat, insists that its labelling is correct, with horsemeat and beef kept clearly apart.
Two suspects were detained at a meat processing plant near Aberystwyth in Wales, and a third was arrested at an abattoir in West Yorkshire.
Ex-abattoir worker Karl Bestford stabbed and mutilated Simon Meech, 46, after inviting him round to his flat in Gateshead, on 28 July last year.
BBC: Gateshead head-severing: Karl Bestford jailed for murder
Meanwhile, test results are from a suspected case at an abattoir on Anglesey in north Wales are now expected to be announced on Tuesday.
The final stages of the cull of 40, 000 animals on Anglesey - which involves the Gaerwen abattoir - is expected to resume on Monday.
The FSA said the Red Lion abattoir in Nantwich could be a risk to public health after it had not followed recommendations from its vets.
The abattoir has not yet responded to the request from the sanctuary, but animal rights campaigners in Dundee and Norwich are confident Bertie will survive.
Two years later another abattoir upped capacity to 500 a day.
FORBES: JBS: The Story Behind The World's Biggest Meat Producer
The supermarket giant had been one of the abattoir's biggest clients.
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