France's government on Wednesday asked a health watchdog to carry out a probe, possibly leading to EU suspension of a genetically-modified corn, after a study in rats linked the grain to cancer.

Agriculture Minister Stephane Le Foll, Ecology Minister Delphine Batho and Health and Social Affairs Minister Marisol Touraine said they had asked the National Agency for Health Safety (ANSES) to investigate the finding.

"Depending on ANSES' opinion, the government will urge the European authorities to take all necessary measures to protect human and animal health," they said in a joint statement.

Earlier, French scientists led by Gilles-Eric Seralini at the University of Caen in Normandy unveiled a study that said rats fed with NK603 corn or exposed to the weedkiller used with it developed tumours.

NK603 is a corn, also called maize, made by US agribusiness giant Monsanto. It has been engineered to make it resistant to Monsanto's herbicide Roundup.

This enables farmers to douse fields with the weedkiller in a single go, thus offering substantial savings.

The study, published in the peer-reviewed journal Food and Chemical Toxicology, says it is the first to look at rats over their normal lifespan of two years.

Two hundred male and female rats were split into 10 groups of 10 animals. One was a "control" group which was given ordinary rat food that contained 33 percent non-GM corn, and plain water.

Three groups were given ordinary rat food and water with increasing doses of Roundup, reflecting various concentrations of the herbicide in the food chain.

The other six were fed rat food of which 11, 22 or 33 percent comprised NK603 corn, either treated or not with Roundup when the corn was grown.

The researchers found that NK603 and Roundup both caused similar damage to the rats' health, whether they were consumed together or on their own.

Premature deaths and sickness were concentrated especially among females. Males which fell sick suffered liver damage, developed kidney and skin tumours and digestive problems.

At the 14-month stage of experiment, no animals in the control groups showed any signs of cancer, but among females in the "treated" groups, tumours affected between 10 and 30 percent of the rodents.

(Read by Brian Salter. Brian Salter is a journalist at the China Daily Website.)

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(Agencies)