As the scandal deepened, Brazil's Agriculture Minister Blairo Maggi said the government had suspended exports from 21 meat processing units.

But he also criticized the investigation by Brazil's Federal Police into meatpacking companies, calling their findings "alarmist" and saying they used a few isolated incidents to tarnish an entire industry that maintains rigorous standards.

An all-out ban on Brazilian meat exports would be a "disaster," Mr Maggi added. "I pray, I hope, I work so that does not happen," he said, speaking to reporters outside his office in Brasilia.

With other import curbs expected to follow, the scandal stemming from a police operation codenamed "Weak Flesh" could deal a heavy blow to one of the few sectors of Latin America's largest economy that has thrived during a two-year recession.

Police on Friday named BRF SA and JBS SA , along with dozens of smaller rivals, in a two-year probe into how meatpackers allegedly paid off inspectors to overlook practices including processing rotten meat, shipping exports with traces of salmonella and simply not carrying out inspections of plants.

JBS is the world's largest meat producer and BRF the biggest poultry exporter.

The companies have denied any wrongdoing, and authorities have said no cases of death or illness have been linked to the tainted meat investigation.

New allegations of unsavory business practices in Brazil come as the country is still reeling from a massive graft scandal centered on state-controlled oil company Petrobras that is widening into other sectors.

Brazil's President Michel Temer has sought to downplay the meatpacking probe, saying it involved only 21 of Brazil's more than 4,800 meat processing units.

But Francisco Turra, head of Brazilian beef producers association ABPA, told reporters it had put the entire meat industry in jeopardy and "destroyed" a hard-won image of quality products.

China, which accounted for nearly one-third of the Brazilian meatpacking industry's $13.9 billion in exports last year, suspended imports of all meat products from Brazil as a precautionary measure.

The European Union suspended imports from four Brazilian meat processing facilities, ABPA said, citing the nation's agriculture ministry.

Ricardo Santin, ABPA's vice president of markets, said two of the suspended plants process poultry, one beef and the other horse meat. One of the poultry plants is operated by BRF, said Santin.

In a statement, BRF said the company has not received any formal notice from Brazilian or foreign authorities related to the suspension of its plants.

South Korea's agriculture ministry said in a statement that it would tighten inspections of imported Brazilian chicken meat and temporarily bar sales of chicken products by BRF.

More than 80 per cent of the 107,400 tons of chicken that South Korea imported last year came from Brazil, and BRF supplied almost half of that.

BRF shares slide

BRF closed down nearly 2.2 per cent Monday, while JBS ended the day up 0.75 per cent as investors bet the scandal would have less effect on the world's largest meatpacker.

BRF could prove more vulnerable to the scandal since a larger share of its operations are physically based in Brazil, while JBS derives most of its sales from abroad, according to a report by Goldman Sachs analysts led by Luca Cipiccia.

Shares of Minerva SA and Marfrig Global Foods SA, which are not involved in the investigations, also fell as traders fretted over the possibility of further import bans.

The scandal "could be enough to compromise temporarily Brazilian protein's acceptance worldwide," Credit Suisse Securities analyst Victor Saragiotto wrote in a Monday note to clients.

Chile is also temporarily banning imports of all Brazilian meat products, the agriculture ministry said on Monday.

The European Commission said the scandal would not affect negotiations between the European Union and South American bloc Mercosur about agreements on free trade.

On the streets of Rio de Janeiro, Brazil's second-largest city, the scandal left many consumers in doubt.

"My freezer at home is full of meat, and I don't know what to do," said Maria Fonseca, a saleswoman. "Should I eat it or just throw it all away?

"It is an enormous waste. If I lived in the countryside, I'd start raising my own cows and chickens!"