24 January 2013
Last updated at 12:20 ET
A drug that Labour says can potentially cause cancer in humans possibly entered the food chain via horses slaughtered in UK abattoirs, it claims.
Shadow environment secretary Mary Creagh said "several" UK-slaughtered horses had contained phenylbutazone, which she described as a carcinogen.
The Food Standards Agency said its checks had prevented horses containing bute from entering the food chain.
And one expert has disputed the claim, saying the drug does not cause cancer.
The news comes after traces of horse and pig DNA was recently found in some burgers.
Some of these were sold in Tesco, Iceland, Lidl, Aldi and Dunnes stores in the UK and Irish Republic. Tesco took out adverts in British newspapers apologising for selling some of the burgers.
There is no suggestion that these burgers contained phenylbutazone.
'Right to know' Phenylbutazone is an anti-inflammatory drug which is given to horses for the treatment of lameness, pain and fever.
It is banned from entering the human food chain within the EU - it is thought to cause bone marrow disorders in rare cases - and horses that have been administered the drug should have the information recorded on their passport.
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For horsemeat containing bute to get into the food chain, several safety processes have to fail.
First the horse's passport tracking its drug history has to be misleading - an illegal act in itself.
Then the horse has to get past the spot checks - relatively easy because not many are carried out.
Finally, the meat has to end up being processed and sold for human use - almost always on the Continent, very little being eaten here.
The numbers involved in this scenario cannot be large since only around 8,000 horses are slaughtered each year.
But checks since 2007 do show bute turning up in small but consistent quantities. And the stuff is best avoided.
A specialist Defra committee says it has "serious adverse effects". Real harm is very unlikely, but the episode once again raises awkward questions about the international meat trade.
But Labour claims the issuing of horse passports in the UK is fragmented, as there are 75 approved issuing organisations in the UK, with no national database to track the information.
Ms Creagh told agriculture minister David Heath in the Commons: "I am in receipt of evidence showing that several horses slaughtered in UK abattoirs last year tested positive for phenylbutazone, or bute, a drug which causes cancer in humans and is banned from the human food chain.
"It is possible that those animals entered the human food chain."
When Ms Creagh asked if Mr Heath was aware of the phenylbutazone cases to which she referred, the minister replied: "The Food Standards Agency carry out checks in slaughterhouses to ensure that equine animals presented for slaughter are fit for human consumption in the same way as they do for cattle, sheep and other animals.
"In addition, the FSA carry out subsequent testing for phenylbutazone and other veterinary medicines in meat from horses slaughtered in this country.
"Where positive results for phenylbutazone are found, the FSA investigates and takes follow-up action to trace the meat."
Ms Creagh then asked if that meant Mr Heath was aware of the issue.
"I'm astonished that you have not raised this and I think the public have a right to know," she said.
She also said the news was a "very serious development" and demanded action to ensure that "illegal and carcinogenic horsemeat stops entering the human food chain".
And she called on the government to reverse a "reckless" decision to end the National Equine Database.
But Mr Heath replied: "There is no difficulty in tracing the use of a horse passport. To suggest the National Equine Database was required to do that is simply erroneous."
Horses checked A Food Standards Agency spokesperson said: "Food Standards Agency checks successfully prevented horses containing bute which had been slaughtered in the UK from entering the UK food chain.
"We also informed the authorities in France about horses which had tested positive for bute and had been exported there.
"The FSA carries out checks in slaughterhouses to ensure that horses slaughtered in the UK are fit for human consumption."
Alastair Hay, professor of environmental toxicology at the University of Leeds, disputed Ms Creagh's claims.
He said there was "no convincing evidence" of phenylbutazone's carcinogenicity in humans "because in the individuals studied many other drugs had also been taken and any one of these might have caused the cancers seen".
And there is no animal evidence either that it is a carcinogen, he added, saying that "phenylbutazone is not classifiable as to its carcinogenicity" according to the International Agency for Research on Cancer.
"The reason the chemical is not for human consumption appears to be rare and idiosyncratic responses in humans to the chemical. These include aplastic anaemia and some other disorders of the bone marrow. But these are not cancer events."
Source: http://www.bbc.co.uk/news/uk-21181499#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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