Tests carried out on four samples of beef from farms where contaminated feed was used have shown dioxin contamination.
The Food Safety Authority says these findings are in line with results from the analysis of pork samples last week.
The authority says that while the levels detected were above the legal limits, the risk to public health is extremely low.
This afternoon's results are from further tests carried out on four beef samples that were identified last week as positive for marker PCBs.
The Food Safety Authority say the risk assessment carried out by them indicates that based on food consumption data, the exposure from beef is 300 times lower than that posed by the pork contamination.
The authority says that consumers should have no concerns about health risks and retailers are not required to take any action.
The Department of Agriculture says that 21 cattle farms received the implicated animal feed.
Because dioxin contamination has now been confirmed in the four samples, the cattle in these locked down farms should now be slaughtered and not allowed to enter the food chain.
Disposal scheme agreed for Irish pork
The EU is to pay about half the cost of a disposal scheme for animals that are blocked on farms that have used contaminated feed at the centre of the recent dioxin crisis.
Europe will also co-finance the disposal of certain pig meat stocks held in slaughterhouses or still owned by slaughterhouses.
Agriculture Commissioner Mariann Fisher Boel said this is another example of how the EU can help Irish farmers at this difficult time.
She hoped that co-funding the destruction of affected meat will help bring this problem to a rapid conclusion and assist farmers that face financial difficulties.
The disposal scheme provides that the financial compensation paid to the suppliers of the animals and of the pig meat should be based on the market value of the products concerned.
The EU Agriculture Management Committee also backed a private storage aid scheme for Northern Ireland similar the one that was proposed for Ireland last week.
Under this scheme, up to 15,000 tonnes of pig meat can be stored for up to six months in Northern Ireland.
The Commission last week introduced a €15m private storage aid scheme for up to 30,000 tonnes of pig meat.
That EU-funded storage scheme, which was formally adopted by the Commission today, covers meat coming from pigs reared in Ireland on farms that have not used any contaminated feed.
Minister for Agriculture, Fisheries and Food Brendan Smith welcomed the decision.
Minister Smith said that this further support was a direct response to the decision taken at the European Council to assist Ireland in this matter.
He added that it 'demonstrated that our European colleagues endorsed the swift and decisive action taken by Ireland and were fully committed to providing all necessary related assistance'.
