Approved supplier Welsh Bros Foods confirmed a sample of its frozen minced beef has 'potentially tested positive' for above 1% horsemeat.
Wholesaler Castell Howell have contacted customers after a 'possible contamination' of cottage pies.
The Welsh Government says it is working with the police to ensure allegations of horse meat at a plant in west Wales are dealt with.
The Food Standards Agency has ordered the recall of meat supplied by a Ceredigion processing plant which was investigated in the horsemeat scandal.
It says Farmbox Meats has supplied frozen lamb, beef and mutton trim that has not been subject to proper temperature controls and that does not comply with traceability rules.
The plant at Llandre stopped trading in June.
Six months ago the horsemeat scandal saw millions of frozen burgers and ready meals taken off supermarket shelves. Today a debate into how that crisis has affected consumer confidence in meat products and what the Welsh industry should do about it took place at the Royal Welsh Show.
As the Royal Welsh Show begins its 50th year the horsemeat scandal is still a concern. The mis-selling of meat which contained horse DNA earlier this year rocked the food industry. Later farm leaders will discuss what lessons can be learned.
Stephen James Deputy President, NFU Cymru, says the scandal has had positive effects.
Six months after the horsemeat crisis erupted, a debate at the Royal Welsh Show will discuss the lessons learnt and the opportunities for the Welsh farming and food industry. There are concerns that consumer confidence in the UK food industry has been seriously dented by the horse meat scandal.
NFU Cymru's campaign message at the Royal Welsh Show is that while Welsh farms produce quality products questions about food authenticity and security of the food supply do need to be addressed.
“The horsemeat scandal demonstrated that equally stringent standards were not necessarily upheld further up the supply chain. The key lesson for consumers is the shorter the supply-chain the lower the chance of something going wrong, the less chance of contamination," says Ed Bailey President.
A debate will take place this afternoon at the show ground which will include Wales' agriculture minister Alun Davies, Professor Nigel Scollan, Waitrose Chair of Food and Farming and Gwyn Howells, Chief Executive of Meat Promotion Wales.
The Food Standards Agency say that burgers' sold in Gwynedd have been withdrawn from sale after they were found to contain horse DNA.
The burgers were made at the Burger Manufacturing Company (BMC) in Builth Wells that previously tested positive for horsemeat.
In a statement on their website, the FSA said that samples taken from products purchased at Nefyn Pizza & Kebab House in Gwynedd were found to contain "horse DNA at or above the 1% threshold for reporting."
Last month the FSA announced it had ended its investigation at BMC, as further tests revealed that the presence of horse DNA below 1%.
The FSA says that the product was not found to contain the veterinary drug bute or pig DNA.
I am today pleased to announce that the testing programme has concluded and of the 200 samples checked by our independent laboratory for the presence of equine (horse) protein, all results show them to be clear of any such contamination. Halal products also tested returned clear.
– Ashley Govier, Cabinet Member, Environment
We have moved swiftly to address issues identified in order to reinforce the traceability within our procurement protocols.
We are also working to ensure that these processes are extended to any other services that use our premises such as after schools clubs and are currently carrying out exercises to enable this.
I am also, pleased to announce that our bid into the collaboration fund has been accepted which will mean an investment of £750k over the next 3 years to help collaborate, rebuild and strengthen our regulatory service.
Cardiff Council say they've found no traces of horsemeat contamination in two hundred samples they sent for testing at the beginning of February.
Their programme of testing involved schools, care homes and council-run food outlets in the wake of the horsemeat scandal.
The Food Standards Agency says it has ended a horsemeat contamination investigation at The Burger Manufacturing Company in Builth Wells, as further tests have revealed that the presence of horse DNA is at a level below 1 percent.
The solicitor acting on behalf of the owner of Farmbox Meats near Aberystwyth has told ITV News that he is pleased by the decision of the Food Standards Agency to lift restrictions against the company.
– Aled Owen, Mr Raw-Rees' solicitor
My client has cooperated fully with with the FSA and has satisfied them that there is no material reason to keep the plant shut.
Mr Raw-Rees is pleased with the outcome and will continue to cooperate with the FSA as he always has.
He would like to thank friends, family, customers and neighbours for their support in this difficult time.