The U.S. government said on Monday 38 poultry farms in Indiana were given contaminated feed in early February containing melamine, with some of the animals likely to have entered the food supply.
The U.S. Agriculture Department and the Food and Drug Administration said there was a "low-risk" to humans and no food recalls were expected at this time. They are uncertain how many animals were involved or entered the food supply.
Pet food tainted with melamine, a chemical used in plastics and fertilizer, was found in feed given to hogs. Last week, USDA said around 6,000 hogs in six states -- California, Kansas, New York, North Carolina, South Carolina and Utah -- may have been given the contaminated feed.