WASHINGTON - Federal scientists have concluded there is no difference between food from cloned animals and food from conventional livestock, setting the stage for the government to declare Thursday that cloned animals are safe for the human food supply.

The Food and Drug Administration planned to brief industry groups in advance of an announcement. The agency indicated it would approve cloned livestock in a scientific journal article published online earlier this month.

The agency "concludes that meat and milk from clones and their progeny is as safe to eat as corresponding products derived from animals produced using contemporary agricultural practices," FDA scientists Larisa Rudenko and John C. Matheson wrote in the Jan. 1 issue of Theriogenology.

Also, FDA believes that no special labels are needed for food from clones or their offspring, the scientists wrote. Consumer groups say labels are a must, because surveys have shown people to be uncomfortable with the idea of cloned livestock.

"Consumers are going to be having a product that has potential safety issues and has a whole load of ethical issues tied to it, without any labeling," said Joseph Mendelson, legal director of the Center for Food Safety.

Carol Tucker Foreman, director of food policy at the Consumer Federation of America, said the FDA is ignoring research that shows cloning results in more deaths and deformed animals than other reproductive technologies.

The consumer federation will ask food companies and supermarkets to refuse to sell food from clones, she said.

"Meat and milk from cloned animals have no benefit for consumers, and consumers don't want them in their foods," Foreman said.

The FDA scientists wrote that by the time clones reached 6 to 18 months of age, they were "virtually indistinguishable" from conventionally bred animals.

Final approval of cloned animals for food is months away; the FDA will accept comments from the public after issuing a risk assessment on Thursday.

Those in favor of the technology say it would be used primarily for breeding and not for steak or pork tenderloin.

Cloning lets farmers and ranchers make copies of exceptional animals, such as pigs that fatten rapidly or cows that are superior milk producers.

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