Animals Australia said it had been filmed inside the two abattoirs approved to process Australian cattle.
These men are said to be the missing link between Romanian abattoirs and French suppliers.
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"The only slaughtering allowed was of those animals already in the abattoirs, " said Mr Billinge.
"One of the first measures taken during the occupation was the closing of kosher abattoirs, " he said.
The supply chain reportedly led back to traders in Cyprus and the Netherlands, then to abattoirs in Romania.
Researchers have started to probe local abattoirs, looking for trends in slaughter practices or product distribution to village shops.
Last week, Canberra suspended exports to abattoirs shown in the programme, but now it has issued a blanket ban.
Romania has launched a probe into its abattoirs in response to the claims.
The supply chain, it seems, reportedly snakes back to traders in Cyprus and the Netherlands, then to abattoirs in Romania.
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The move follows an investigation into Indonesian abattoirs by Australia's ABC broadcaster, which showed graphic footage of animals being mistreated.
Australia is suspending the export of live cattle to Egypt after video emerged showing extreme cruelty to animals in Egyptian abattoirs.
Last week, the Australian government announced a ban on live cattle exports to the 12 abattoirs featured in the report.
Authorities have revealed a lengthy supply chain that traced the horse meat back to Romanian abattoirs, via Dutch and Cypriot food traders.
The ban will remain in place for at least six months, in the hope that safeguards can be introduced at Indonesian abattoirs.
Indonesian officials have rebuffed claims of widespread animal cruelty in their abattoirs.
The horse meat scandal began with tons of horse meat from Romanian abattoirs exported to France, where it was processed into ready-made meals.
Other questions encompassed hydrotherapy for people with progressive conditions, immigration applications, and whether CCTV cameras should be installed in abattoirs to reduce animal cruelty.
The seven-day ban came into force at 1700 GMT on Friday and all livestock markets and abattoirs in England and Wales have been shut.
The FSA was concerned that if abattoirs closed down, there would be a range of knock-on problems that would also have cost money to deal with.
When it swills out of abattoirs and rendering-plants it carries some animal excrement, along with all the other debris for which even industrial meat processing finds no use.
Baroness Byford was up next with a question on abattoirs.
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Robots put chocolates into a box, sort apples, make salads and wield knives in chilly abattoirs, butchering carcasses without having to take a rest or visit the toilet.
Meat from the estimated 50, 000 animals can now only be classed as Lakeland Herdwick if they are born, reared and slaughtered at one of three registered abattoirs in Cumbria.
Richard Billinge, from the Meat Hygiene Service which oversees the work of Great Britain's abattoirs, said more than half of the 305 red meat slaughterhouses were closed on Monday.
More than a week after its broadcast, powerful reverberations are still being felt from the ABC Four Corners investigation into the mistreatment of Australian cattle in Indonesian abattoirs.
Robert Huey, NI's Department of Agriculture's deputy chief veterinary officer, said that he was satisfied that rumours of the illegal slaughter of horses at Northern Ireland abattoirs were not correct.
Meanwhile, the prime minister of Romania, where two abattoirs are alleged to have sold horsemeat purported to be beef to European food companies, has said that the scandal is a continent-wide problem.
While the source of the pigs is being sought, rumors have it that livestock upriver are dying of disease and authorities have cracked down on the sale of sick and dead animals to abattoirs.
The EU has already conceded that scanners can be held at markets and abattoirs - rather than on every single farm - which according to the Scottish government reduces the cost by about 50%.
The ban is the result of public revulsion and outrage at the gruesome footage from Indonesia's abattoirs that was broadcast last week in an ABC TV documentary, says the BBC's Nick Bryant in Sydney.
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